ps


SYNOPSIS

       ps [options]


DESCRIPTION

       ps displays information about a selection of the active processes.  If
       you want a repetitive update of the selection and the displayed
       information, use top(1) instead.

       This version of ps accepts several kinds of options:

       1   UNIX options, which may be grouped and must be preceded by a dash.
       2   BSD options, which may be grouped and must not be used with a dash.
       3   GNU long options, which are preceded by two dashes.

       Options of different types may be freely mixed, but conflicts can
       appear.  There are some synonymous options, which are functionally
       identical, due to the many standards and ps implementations that this
       ps is compatible with.

       Note that "ps -aux" is distinct from "ps aux".  The POSIX and UNIX
       standards require that "ps -aux" print all processes owned by a user
       named "x", as well as printing all processes that would be selected by
       the -a option.  If the user named "x" does not exist, this ps may
       interpret the command as "ps aux" instead and print a warning.  This
       behavior is intended to aid in transitioning old scripts and habits.
       It is fragile, subject to change, and thus should not be relied upon.

       By default, ps selects all processes with the same effective user ID
       (euid=EUID) as the current user and associated with the same terminal
       as the invoker.  It displays the process ID (pid=PID), the terminal
       associated with the process (tname=TTY), the cumulated CPU time in
       [DD-]hh:mm:ss format (time=TIME), and the executable name (ucmd=CMD).
       Output is unsorted by default.

       The use of BSD-style options will add process state (stat=STAT) to the
       default display and show the command args (args=COMMAND) instead of the
       executable name.  You can override this with the PS_FORMAT environment
       variable. The use of BSD-style options will also change the process
       selection to include processes on other terminals (TTYs) that are owned
       by you; alternately, this may be described as setting the selection to
       be the set of all processes filtered to exclude processes owned by
       other users or not on a terminal.  These effects are not considered
       when options are described as being "identical" below, so -M will be
       considered identical to Z and so on.

       Except as described below, process selection options are additive.  The
       default selection is discarded, and then the selected processes are
       added to the set of processes to be displayed.  A process will thus be
       shown if it meets any of the given selection criteria.


EXAMPLES

       To see every process on the system using standard syntax:
          ps -eLf
          ps axms

       To get security info:
          ps -eo euser,ruser,suser,fuser,f,comm,label
          ps axZ
          ps -eM

       To see every process running as root (real & effective ID) in user
       format:
          ps -U root -u root u

       To see every process with a user-defined format:
          ps -eo pid,tid,class,rtprio,ni,pri,psr,pcpu,stat,wchan:14,comm
          ps axo stat,euid,ruid,tty,tpgid,sess,pgrp,ppid,pid,pcpu,comm
          ps -Ao pid,tt,user,fname,tmout,f,wchan

       Print only the process IDs of syslogd:
          ps -C syslogd -o pid=

       Print only the name of PID 42:
          ps -q 42 -o comm=


SIMPLE PROCESS SELECTION

       a      Lift the BSD-style "only yourself" restriction, which is imposed
              upon the set of all processes when some BSD-style (without "-")
              options are used or when the ps personality setting is BSD-like.
              The set of processes selected in this manner is in addition to
              the set of processes selected by other means.  An alternate
              description is that this option causes ps to list all processes
              with a terminal (tty), or to list all processes when used
              together with the x option.

       -A     Select all processes.  Identical to -e.

       -a     Select all processes except both session leaders (see getsid(2))
              and processes not associated with a terminal.

       -d     Select all processes except session leaders.

       --deselect
              Select all processes except those that fulfill the specified
              conditions (negates the selection).  Identical to -N.

       -e     Select all processes.  Identical to -A.

       g      Really all, even session leaders.  This flag is obsolete and may
              be discontinued in a future release.  It is normally implied by
              the a flag, and is only useful when operating in the sunos4
              personality.

       -N     Select all processes except those that fulfill the specified
              all processes when used together with the a option.


PROCESS SELECTION BY LIST

       These options accept a single argument in the form of a blank-separated
       or comma-separated list.  They can be used multiple times.  For
       example: ps -p "1 2" -p 3,4

       -123   Identical to --pid 123.

       123    Identical to --pid 123.

       -C cmdlist
              Select by command name.  This selects the processes whose
              executable name is given in cmdlist.

       -G grplist
              Select by real group ID (RGID) or name.  This selects the
              processes whose real group name or ID is in the grplist list.
              The real group ID identifies the group of the user who created
              the process, see getgid(2).

       -g grplist
              Select by session OR by effective group name.  Selection by
              session is specified by many standards, but selection by
              effective group is the logical behavior that several other
              operating systems use.  This ps will select by session when the
              list is completely numeric (as sessions are).  Group ID numbers
              will work only when some group names are also specified.  See
              the -s and --group options.

       --Group grplist
              Select by real group ID (RGID) or name.  Identical to -G.

       --group grplist
              Select by effective group ID (EGID) or name.  This selects the
              processes whose effective group name or ID is in grplist.  The
              effective group ID describes the group whose file access
              permissions are used by the process (see getegid(2)).  The -g
              option is often an alternative to --group.

       p pidlist
              Select by process ID.  Identical to -p and --pid.

       -p pidlist
              Select by PID.  This selects the processes whose process ID
              numbers appear in pidlist.  Identical to p and --pid.

       --pid pidlist
              Select by process ID.  Identical to -p and p.

       --ppid pidlist
              Select by parent process ID.  This selects the processes with a
              q and --quick-pid.

       --quick-pid pidlist
              Select by process ID (quick mode).  Identical to -q and q.

       -s sesslist
              Select by session ID.  This selects the processes with a session
              ID specified in sesslist.

       --sid sesslist
              Select by session ID.  Identical to -s.

       t ttylist
              Select by tty.  Nearly identical to -t and --tty, but can also
              be used with an empty ttylist to indicate the terminal
              associated with ps.  Using the T option is considered cleaner
              than using t with an empty ttylist.

       -t ttylist
              Select by tty.  This selects the processes associated with the
              terminals given in ttylist.  Terminals (ttys, or screens for
              text output) can be specified in several forms: /dev/ttyS1,
              ttyS1, S1.  A plain "-" may be used to select processes not
              attached to any terminal.

       --tty ttylist
              Select by terminal.  Identical to -t and t.

       U userlist
              Select by effective user ID (EUID) or name.  This selects the
              processes whose effective user name or ID is in userlist.  The
              effective user ID describes the user whose file access
              permissions are used by the process (see geteuid(2)).  Identical
              to -u and --user.

       -U userlist
              Select by real user ID (RUID) or name.  It selects the processes
              whose real user name or ID is in the userlist list.  The real
              user ID identifies the user who created the process, see
              getuid(2).

       -u userlist
              Select by effective user ID (EUID) or name.  This selects the
              processes whose effective user name or ID is in userlist.

              The effective user ID describes the user whose file access
              permissions are used by the process (see geteuid(2)).  Identical
              to U and --user.

       --User userlist
              Select by real user ID (RUID) or name.  Identical to -U.

              other UNIX-style options to add additional columns.  It also
              causes the command arguments to be printed.  When used with -L,
              the NLWP (number of threads) and LWP (thread ID) columns will be
              added.  See the c option, the format keyword args, and the
              format keyword comm.

       -F     Extra full format.  See the -f option, which -F implies.

       --format format
              user-defined format.  Identical to -o and o.

       j      BSD job control format.

       -j     Jobs format.

       l      Display BSD long format.

       -l     Long format.  The -y option is often useful with this.

       -M     Add a column of security data.  Identical to Z (for SELinux).

       O format
              is preloaded o (overloaded).  The BSD O option can act like -O
              (user-defined output format with some common fields predefined)
              or can be used to specify sort order.  Heuristics are used to
              determine the behavior of this option.  To ensure that the
              desired behavior is obtained (sorting or formatting), specify
              the option in some other way (e.g.  with -O or --sort).  When
              used as a formatting option, it is identical to -O, with the BSD
              personality.

       -O format
              Like -o, but preloaded with some default columns.  Identical to
              -o pid,format,state,tname,time,command or -o pid,format,tname,
              time,cmd, see -o below.

       o format
              Specify user-defined format.  Identical to -o and --format.

       -o format
              User-defined format.  format is a single argument in the form of
              a blank-separated or comma-separated list, which offers a way to
              specify individual output columns.  The recognized keywords are
              described in the STANDARD FORMAT SPECIFIERS section below.
              Headers may be renamed (ps -o pid,ruser=RealUser -o
              comm=Command) as desired.  If all column headers are empty (ps
              -o pid= -o comm=) then the header line will not be output.
              Column width will increase as needed for wide headers; this may
              be used to widen up columns such as WCHAN (ps -o pid,wchan=WIDE-
              WCHAN-COLUMN -o comm).  Explicit width control (ps opid,
              wchan:42,cmd) is offered too.  The behavior of ps -o pid=X,
              comm=Y varies with personality; output may be one column named
              only be used with -l.

       Z      Add a column of security data.  Identical to -M (for SELinux).


OUTPUT MODIFIERS

       c      Show the true command name.  This is derived from the name of
              the executable file, rather than from the argv value.  Command
              arguments and any modifications to them are thus not shown.
              This option effectively turns the args format keyword into the
              comm format keyword; it is useful with the -f format option and
              with the various BSD-style format options, which all normally
              display the command arguments.  See the -f option, the format
              keyword args, and the format keyword comm.

       --cols n
              Set screen width.

       --columns n
              Set screen width.

       --cumulative
              Include some dead child process data (as a sum with the parent).

       e      Show the environment after the command.

       f      ASCII art process hierarchy (forest).

       --forest
              ASCII art process tree.

       h      No header.  (or, one header per screen in the BSD personality).
              The h option is problematic.  Standard BSD ps uses this option
              to print a header on each page of output, but older Linux ps
              uses this option to totally disable the header.  This version of
              ps follows the Linux usage of not printing the header unless the
              BSD personality has been selected, in which case it prints a
              header on each page of output.  Regardless of the current
              personality, you can use the long options --headers and
              --no-headers to enable printing headers each page or disable
              headers entirely, respectively.

       -H     Show process hierarchy (forest).

       --headers
              Repeat header lines, one per page of output.

       k spec Specify sorting order.  Sorting syntax is
              [+|-]key[,[+|-]key[,...]].  Choose a multi-letter key from the
              STANDARD FORMAT SPECIFIERS section.  The "+" is optional since
              default direction is increasing numerical or lexicographic
              order.  Identical to --sort.

                      $PS_SYSMAP
                      $PS_SYSTEM_MAP
                      /proc/*/wchan
                      /boot/System.map-$(uname -r)
                      /boot/System.map
                      /lib/modules/$(uname -r)/System.map
                      /usr/src/linux/System.map
                      /System.map

       n      Numeric output for WCHAN and USER (including all types of UID
              and GID).

       N namelist
              Specify namelist file.  Identical to -n, see -n above.

       --no-headers
              Print no header line at all.  --no-heading is an alias for this
              option.

       O order
              Sorting order (overloaded).  The BSD O option can act like -O
              (user-defined output format with some common fields predefined)
              or can be used to specify sort order.  Heuristics are used to
              determine the behavior of this option.  To ensure that the
              desired behavior is obtained (sorting or formatting), specify
              the option in some other way (e.g.  with -O or --sort).

              For sorting, obsolete BSD O option syntax is
              O[+|-]k1[,[+|-]k2[,...]].  It orders the processes listing
              according to the multilevel sort specified by the sequence of
              one-letter short keys k1,k2, ...  described in the OBSOLETE SORT
              KEYS section below.  The "+" is currently optional, merely
              re-iterating the default direction on a key, but may help to
              distinguish an O sort from an O format.  The "-" reverses
              direction only on the key it precedes.

       --rows n
              Set screen height.

       S      Sum up some information, such as CPU usage, from dead child
              processes into their parent.  This is useful for examining a
              system where a parent process repeatedly forks off short-lived
              children to do work.

       --sort spec
              Specify sorting order.  Sorting syntax is
              [+|-]key[,[+|-]key[,...]].  Choose a multi-letter key from the
              STANDARD FORMAT SPECIFIERS section.  The "+" is optional since
              default direction is increasing numerical or lexicographic
              order.  Identical to k.  For example: ps jax --sort=uid,-ppid,
              +pid

       -m     Show threads after processes.

       -T     Show threads, possibly with SPID column.


OTHER INFORMATION

       --help section
              Print a help message.  The section argument can be one of
              simple, list, output, threads, misc or all.  The argument can be
              shortened to one of the underlined letters as in: s|l|o|t|m|a.

       --info Print debugging info.

       L      List all format specifiers.

       V      Print the procps-ng version.

       -V     Print the procps-ng version.

       --version
              Print the procps-ng version.


NOTES

       This ps works by reading the virtual files in /proc.  This ps does not
       need to be setuid kmem or have any privileges to run.  Do not give this
       ps any special permissions.

       This ps needs access to namelist data for proper WCHAN display.  For
       kernels prior to 2.6, the System.map file must be installed.

       CPU usage is currently expressed as the percentage of time spent
       running during the entire lifetime of a process.  This is not ideal,
       and it does not conform to the standards that ps otherwise conforms to.
       CPU usage is unlikely to add up to exactly 100%.

       The SIZE and RSS fields don't count some parts of a process including
       the page tables, kernel stack, struct thread_info, and struct
       task_struct.  This is usually at least 20 KiB of memory that is always
       resident.  SIZE is the virtual size of the process (code+data+stack).

       Processes marked <defunct> are dead processes (so-called "zombies")
       that remain because their parent has not destroyed them properly.
       These processes will be destroyed by init(8) if the parent process
       exits.

       If the length of the username is greater than the length of the display
       column, the numeric user ID is displayed instead.

       Commands options such as ps -aux are not recommended as it is a
       confusion of two different standards.  According to the POSIX and UNIX
       standards, the above command asks to display all processes with a TTY
       (generally the commands users are running) plus all processes owned by
       a user named "x".  If that user doesn't exist, then ps will assume you
               D    uninterruptible sleep (usually IO)
               R    running or runnable (on run queue)
               S    interruptible sleep (waiting for an event to complete)
               T    stopped by job control signal
               t    stopped by debugger during the tracing
               W    paging (not valid since the 2.6.xx kernel)
               X    dead (should never be seen)
               Z    defunct ("zombie") process, terminated but not reaped by
                    its parent

       For BSD formats and when the stat keyword is used, additional
       characters may be displayed:

               <    high-priority (not nice to other users)
               N    low-priority (nice to other users)
               L    has pages locked into memory (for real-time and custom IO)
               s    is a session leader
               l    is multi-threaded (using CLONE_THREAD, like NPTL pthreads
                    do)
               +    is in the foreground process group


OBSOLETE SORT KEYS

       These keys are used by the BSD O option (when it is used for sorting).
       The GNU --sort option doesn't use these keys, but the specifiers
       described below in the STANDARD FORMAT SPECIFIERS section.  Note that
       the values used in sorting are the internal values ps uses and not the
       "cooked" values used in some of the output format fields (e.g.  sorting
       on tty will sort into device number, not according to the terminal name
       displayed).  Pipe ps output into the sort(1) command if you want to
       sort the cooked values.

       KEY   LONG         DESCRIPTION
       c     cmd          simple name of executable
       C     pcpu         cpu utilization
       f     flags        flags as in long format F field
       g     pgrp         process group ID
       G     tpgid        controlling tty process group ID
       j     cutime       cumulative user time
       J     cstime       cumulative system time
       k     utime        user time
       m     min_flt      number of minor page faults
       M     maj_flt      number of major page faults
       n     cmin_flt     cumulative minor page faults
       N     cmaj_flt     cumulative major page faults
       o     session      session ID
       p     pid          process ID
       P     ppid         parent process ID
       r     rss          resident set size
       R     resident     resident pages
       s     size         memory size in kilobytes
       S     share        amount of shared pages
       t     tty          the device number of the controlling tty
       %G     group    GROUP
       %P     ppid     PPID
       %U     user     USER
       %a     args     COMMAND
       %c     comm     COMMAND
       %g     rgroup   RGROUP
       %n     nice     NI
       %p     pid      PID
       %r     pgid     PGID
       %t     etime    ELAPSED
       %u     ruser    RUSER
       %x     time     TIME
       %y     tty      TTY

       %z     vsz      VSZ


STANDARD FORMAT SPECIFIERS

       Here are the different keywords that may be used to control the output
       format (e.g. with option -o) or to sort the selected processes with the
       GNU-style --sort option.

       For example: ps -eo pid,user,args --sort user

       This version of ps tries to recognize most of the keywords used in
       other implementations of ps.

       The following user-defined format specifiers may contain spaces:
       args, cmd, comm, command, fname, ucmd, ucomm, lstart, bsdstart, start.

       Some keywords may not be available for sorting.

       CODE        HEADER    DESCRIPTION

       %cpu        %CPU      cpu utilization of the process in "##.#" format.
                             Currently, it is the CPU time used divided by the
                             time the process has been running
                             (cputime/realtime ratio), expressed as a
                             percentage.  It will not add up to 100% unless
                             you are lucky.  (alias pcpu).

       %mem        %MEM      ratio of the process's resident set size  to the
                             physical memory on the machine, expressed as a
                             percentage.  (alias pmem).

       args        COMMAND   command with all its arguments as a string.
                             Modifications to the arguments may be shown.  The
                             output in this column may contain spaces.  A
                             process marked <defunct> is partly dead, waiting
                             to be fully destroyed by its parent.  Sometimes
                             the process args will be unavailable; when this
                             happens, ps will instead print the executable

       blocked     BLOCKED   mask of the blocked signals, see signal(7).
                             According to the width of the field, a 32 or
                             64-bit mask in hexadecimal format is displayed.
                             (alias sig_block, sigmask).

       bsdstart    START     time the command started.  If the process was
                             started less than 24 hours ago, the output format
                             is " HH:MM", else it is " Mmm:SS" (where Mmm is
                             the three letters of the month).  See also
                             lstart, start, start_time, and stime.

       bsdtime     TIME      accumulated cpu time, user + system.  The display
                             format is usually "MMM:SS", but can be shifted to
                             the right if the process used more than 999
                             minutes of cpu time.

       c           C         processor utilization. Currently, this is the
                             integer value of the percent usage over the
                             lifetime of the process.  (see %cpu).

       caught      CAUGHT    mask of the caught signals, see signal(7).
                             According to the width of the field, a 32 or 64
                             bits mask in hexadecimal format is displayed.
                             (alias sig_catch, sigcatch).

       cgroup      CGROUP    display control groups to which the process
                             belongs.

       class       CLS       scheduling class of the process.  (alias
                             policy, cls).  Field's possible values are:

                                      -   not reported
                                      TS  SCHED_OTHER
                                      FF  SCHED_FIFO
                                      RR  SCHED_RR
                                      B   SCHED_BATCH
                                      ISO SCHED_ISO
                                      IDL SCHED_IDLE
                                      ?   unknown value

       cls         CLS       scheduling class of the process.  (alias
                             policy, cls).  Field's possible values are:

                                      -   not reported
                                      TS  SCHED_OTHER
                                      FF  SCHED_FIFO
                                      RR  SCHED_RR
                                      B   SCHED_BATCH
                                      ISO SCHED_ISO
                                      IDL SCHED_IDLE
                                      ?   unknown value

                             output width is undefined (it may be 80,
                             unlimited, determined by the TERM variable, and
                             so on).  The COLUMNS environment variable or
                             --cols option may be used to exactly determine
                             the width in this case.  The w or -w option may
                             be also be used to adjust width.

       command     COMMAND   See args.  (alias args, command).

       cp          CP        per-mill (tenths of a percent) CPU usage.  (see
                             %cpu).

       cputime     TIME      cumulative CPU time, "[DD-]hh:mm:ss" format.
                             (alias time).

       drs         DRS       data resident set size, the amount of physical
                             memory devoted to other than executable code.

       egid        EGID      effective group ID number of the process as a
                             decimal integer.  (alias gid).

       egroup      EGROUP    effective group ID of the process.  This will be
                             the textual group ID, if it can be obtained and
                             the field width permits, or a decimal
                             representation otherwise.  (alias group).

       eip         EIP       instruction pointer.

       esp         ESP       stack pointer.

       etime       ELAPSED   elapsed time since the process was started, in
                             the form [[DD-]hh:]mm:ss.

       etimes      ELAPSED   elapsed time since the process was started, in
                             seconds.

       euid        EUID      effective user ID (alias uid).

       euser       EUSER     effective user name.  This will be the textual
                             user ID, if it can be obtained and the field
                             width permits, or a decimal representation
                             otherwise.  The n option can be used to force the
                             decimal representation.  (alias uname, user).

       f           F         flags associated with the process, see the
                             PROCESS FLAGS section.  (alias flag, flags).

       fgid        FGID      filesystem access group ID.  (alias fsgid).

       fgroup      FGROUP    filesystem access group ID.  This will be the
       fuser       FUSER     filesystem access user ID.  This will be the
                             textual user ID, if it can be obtained and the
                             field width permits, or a decimal representation
                             otherwise.

       gid         GID       see egid.  (alias egid).

       group       GROUP     see egroup.  (alias egroup).

       ignored     IGNORED   mask of the ignored signals, see signal(7).
                             According to the width of the field, a 32 or 64
                             bits mask in hexadecimal format is displayed.
                             (alias sig_ignore, sigignore).

       ipcns       IPCNS     Unique inode number describing the namespace the
                             process belongs to. See namespaces(7).

       label       LABEL     security label, most commonly used for SELinux
                             context data.  This is for the Mandatory Access
                             Control ("MAC") found on high-security systems.

       lstart      STARTED   time the command started.  See also
                             bsdstart, start, start_time, and stime.

       lsession    SESSION   displays the login session identifier of a
                             process, if systemd support has been included.

       lwp         LWP       light weight process (thread) ID of the
                             dispatchable entity (alias spid, tid).  See tid
                             for additional information.

       machine     MACHINE   displays the machine name for processes assigned
                             to VM or container, if systemd support has been
                             included.

       maj_flt     MAJFLT    The number of major page faults that have
                             occurred with this process.

       min_flt     MINFLT    The number of minor page faults that have
                             occurred with this process.

       mntns       MNTNS     Unique inode number describing the namespace the
                             process belongs to. See namespaces(7).

       netns       NETNS     Unique inode number describing the namespace the
                             process belongs to. See namespaces(7).

       ni          NI        nice value. This ranges from 19 (nicest) to -20
                             (not nice to others), see nice(1).  (alias nice).

       pcpu        %CPU      see %cpu.  (alias %cpu).

       pending     PENDING   mask of the pending signals. See signal(7).
                             Signals pending on the process are distinct from
                             signals pending on individual threads.  Use the m
                             option or the -m option to see both.  According
                             to the width of the field, a 32 or 64 bits mask
                             in hexadecimal format is displayed.  (alias sig).

       pgid        PGID      process group ID or, equivalently, the process ID
                             of the process group leader.  (alias pgrp).

       pgrp        PGRP      see pgid.  (alias pgid).

       pid         PID       a number representing the process ID (alias
                             tgid).

       pidns       PIDNS     Unique inode number describing the namespace the
                             process belongs to. See namespaces(7).

       pmem        %MEM      see %mem.  (alias %mem).

       policy      POL       scheduling class of the process.  (alias
                             class, cls).  Possible values are:

                                      -   not reported
                                      TS  SCHED_OTHER
                                      FF  SCHED_FIFO
                                      RR  SCHED_RR
                                      B   SCHED_BATCH
                                      ISO SCHED_ISO
                                      IDL SCHED_IDLE
                                      ?   unknown value

       ppid        PPID      parent process ID.

       pri         PRI       priority of the process.  Higher number means
                             lower priority.

       psr         PSR       processor that process is currently assigned to.

       rgid        RGID      real group ID.

       rgroup      RGROUP    real group name.  This will be the textual group
                             ID, if it can be obtained and the field width
                             permits, or a decimal representation otherwise.

       rss         RSS       resident set size, the non-swapped physical

       s           S         minimal state display (one character).  See
                             section PROCESS STATE CODES for the different
                             values.  See also stat if you want additional
                             information displayed.  (alias state).

       sched       SCH       scheduling policy of the process.  The policies
                             SCHED_OTHER (SCHED_NORMAL), SCHED_FIFO, SCHED_RR,
                             SCHED_BATCH, SCHED_ISO, and SCHED_IDLE are
                             respectively displayed as 0, 1, 2, 3, 4, and 5.

       seat        SEAT      displays the identifier associated with all
                             hardware devices assigned to a specific
                             workplace, if systemd support has been included.

       sess        SESS      session ID or, equivalently, the process ID of
                             the session leader.  (alias session, sid).

       sgi_p       P         processor that the process is currently executing
                             on.  Displays "*" if the process is not currently
                             running or runnable.

       sgid        SGID      saved group ID.  (alias svgid).

       sgroup      SGROUP    saved group name.  This will be the textual group
                             ID, if it can be obtained and the field width
                             permits, or a decimal representation otherwise.

       sid         SID       see sess.  (alias sess, session).

       sig         PENDING   see pending.  (alias pending, sig_pend).

       sigcatch    CAUGHT    see caught.  (alias caught, sig_catch).

       sigignore   IGNORED   see ignored.  (alias ignored, sig_ignore).

       sigmask     BLOCKED   see blocked.  (alias blocked, sig_block).

       size        SIZE      approximate amount of swap space that would be
                             required if the process were to dirty all
                             writable pages and then be swapped out.  This
                             number is very rough!

       slice       SLICE     displays the slice unit which a process belongs
                             to, if systemd support has been included.

       spid        SPID      see lwp.  (alias lwp, tid).

       stackp      STACKP    address of the bottom (start) of stack for the
                             process.

                             PROCESS STATE CODES for the different values
                             meaning.  See also s and state if you just want
                             the first character displayed.

       state       S         see s. (alias s).

       suid        SUID      saved user ID.  (alias svuid).

       supgid      SUPGID    group ids of supplementary groups, if any.  See
                             getgroups(2).

       supgrp      SUPGRP    group names of supplementary groups, if any.  See
                             getgroups(2).

       suser       SUSER     saved user name.  This will be the textual user
                             ID, if it can be obtained and the field width
                             permits, or a decimal representation otherwise.
                             (alias svuser).

       svgid       SVGID     see sgid.  (alias sgid).

       svuid       SVUID     see suid.  (alias suid).

       sz          SZ        size in physical pages of the core image of the
                             process.  This includes text, data, and stack
                             space.  Device mappings are currently excluded;
                             this is subject to change.  See vsz and rss.

       tgid        TGID      a number representing the thread group to which a
                             task belongs (alias pid).  It is the process ID
                             of the thread group leader.

       thcgr       THCGR     display control groups to which the thread
                             belongs.

       thcount     THCNT     see nlwp.  (alias nlwp).  number of kernel
                             threads owned by the process.

       tid         TID       the unique number representing a dispatchable
                             entity (alias lwp, spid).  This value may also
                             appear as: a process ID (pid); a process group ID
                             (pgrp); a session ID for the session leader
                             (sid); a thread group ID for the thread group
                             leader (tgid); and a tty process group ID for the
                             process group leader (tpgid).

       time        TIME      cumulative CPU time, "[DD-]HH:MM:SS" format.
                             (alias cputime).

       tname       TTY       controlling tty (terminal).  (alias tt, tty).


       uid         UID       see euid.  (alias euid).

       uname       USER      see euser.  (alias euser, user).

       unit        UNIT      displays unit which a process belongs to, if
                             systemd support has been included.

       user        USER      see euser.  (alias euser, uname).

       userns      USERNS    Unique inode number describing the namespace the
                             process belongs to. See namespaces(7).

       utsns       UTSNS     Unique inode number describing the namespace the
                             process belongs to. See namespaces(7).

       uunit       UUNIT     displays user unit which a process belongs to, if
                             systemd support has been included.

       vsize       VSZ       see vsz.  (alias vsz).

       vsz         VSZ       virtual memory size of the process in KiB
                             (1024-byte units).  Device mappings are currently
                             excluded; this is subject to change.  (alias
                             vsize).

       wchan       WCHAN     name of the kernel function in which the process
                             is sleeping, a "-" if the process is running, or
                             a "*" if the process is multi-threaded and ps is
                             not displaying threads.


ENVIRONMENT VARIABLES

       The following environment variables could affect ps:

       COLUMNS
          Override default display width.

       LINES
          Override default display height.

       PS_PERSONALITY
          Set to one of posix, old, linux, bsd, sun, digital...  (see section
          PERSONALITY below).

       CMD_ENV
          Set to one of posix, old, linux, bsd, sun, digital...  (see section
          PERSONALITY below).

       I_WANT_A_BROKEN_PS
          Force obsolete command line interpretation.

       PS_SYSTEM_MAP
          Default namelist (System.map) location.

       POSIXLY_CORRECT
          Don't find excuses to ignore bad "features".

       POSIX2
          When set to "on", acts as POSIXLY_CORRECT.

       UNIX95
          Don't find excuses to ignore bad "features".

       _XPG
          Cancel CMD_ENV=irix non-standard behavior.

       In general, it is a bad idea to set these variables.  The one exception
       is CMD_ENV or PS_PERSONALITY, which could be set to Linux for normal
       systems.  Without that setting, ps follows the useless and bad parts of
       the Unix98 standard.


PERSONALITY

       390        like the OS/390 OpenEdition ps
       aix        like AIX ps
       bsd        like FreeBSD ps (totally non-standard)
       compaq     like Digital Unix ps
       debian     like the old Debian ps
       digital    like Tru64 (was Digital Unix, was OSF/1) ps
       gnu        like the old Debian ps
       hp         like HP-UX ps
       hpux       like HP-UX ps
       irix       like Irix ps
       linux      ***** recommended *****
       old        like the original Linux ps (totally non-standard)
       os390      like OS/390 Open Edition ps
       posix      standard
       s390       like OS/390 Open Edition ps
       sco        like SCO ps

       sgi        like Irix ps
       solaris2   like Solaris 2+ (SunOS 5) ps
       sunos4     like SunOS 4 (Solaris 1) ps (totally non-standard)
       svr4       standard
       sysv       standard
       tru64      like Tru64 (was Digital Unix, was OSF/1) ps
       unix       standard
       unix95     standard
       unix98     standard


SEE ALSO

       pgrep(1), pstree(1), top(1), proc(5).


STANDARDS

       library, the device name-to-number mmaped database, the approximate
       binary search directly on System.map, and many code and documentation
       cleanups.  David Mossberger-Tang wrote the generic BFD support for
       psupdate.  Albert Cahalan <albert@users.sf.net> rewrote ps for full
       Unix98 and BSD support, along with some ugly hacks for obsolete and
       foreign syntax.

       Please send bug reports to <procps@freelists.org>.  No subscription is
       required or suggested.


procps-ng July 2014 PS(1)



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