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lesskey


SYNOPSIS

       lesskey [-o output] [--] [input]
       lesskey [--output=output] [--] [input]
       lesskey -V
       lesskey --version


DESCRIPTION

       Lesskey  is  used  to specify a set of key bindings to be used by less.
       The input file is a text file which describes the key bindings.  If the
       input  file is "-", standard input is read.  If no input file is speci-
       fied, a standard filename is used as the name of the input file,  which
       depends  on  the  system being used: On Unix systems, $HOME/.lesskey is
       used; on MS-DOS systems, $HOME/_lesskey is used; and  on  OS/2  systems
       $HOME/lesskey.ini  is used, or $INIT/lesskey.ini if $HOME is undefined.
       The output file is a binary file which is used by less.  If  no  output
       file  is  specified,  and  the environment variable LESSKEY is set, the
       value of LESSKEY is used as the name of the output file.  Otherwise,  a
       standard filename is used as the name of the output file, which depends
       on the system being used: On Unix  and  OS-9  systems,  $HOME/.less  is
       used;  on  MS-DOS  systems,  $HOME/_less  is used; and on OS/2 systems,
       $HOME/less.ini is used, or $INIT/less.ini if $HOME  is  undefined.   If
       the output file already exists, lesskey will overwrite it.

       The  -V  or --version option causes lesskey to print its version number
       and immediately exit.  If -V or --version is present, other options and
       arguments are ignored.

       The  input  file consists of one or more sections.  Each section starts
       with a line that identifies the type  of  section.   Possible  sections
       are:

       #command
              Defines new command keys.

       #line-edit
              Defines new line-editing keys.

       #env   Defines environment variables.

       Blank  lines  and  lines which start with a pound sign (#) are ignored,
       except for the special section header lines.


COMMAND SECTION

       The command section begins with the line

       #command

       If the command section is the first section in the file, this line  may
       be omitted.  The command section consists of lines of the form:

            string <whitespace> action [extra-string] <newline>

       \n     NEWLINE

       \r     RETURN

       \t     TAB

       \ku    UP ARROW

       \kd    DOWN ARROW

       \kr    RIGHT ARROW

       \kl    LEFT ARROW

       \kU    PAGE UP

       \kD    PAGE DOWN

       \kh    HOME

       \ke    END

       \kx    DELETE

       A backslash followed by any other character indicates that character is
       to  be taken literally.  Characters which must be preceded by backslash
       include caret, space, tab and the backslash itself.

       An action may be followed by an "extra" string.  When such a command is
       entered while running less, the action is performed, and then the extra
       string is parsed, just as if it were typed in to  less.   This  feature
       can  be used in certain cases to extend the functionality of a command.
       For example, see the "{" and ":t" commands in the example  below.   The
       extra  string  has  a  special meaning for the "quit" action: when less
       quits, first character of the extra string is used as its exit status.


EXAMPLE

       The following input file describes the set of default command keys used
       by less:

            #command
            \r        forw-line
            \n        forw-line
            e         forw-line
            j         forw-line
            \kd  forw-line
            ^E        forw-line
            ^N        forw-line
            k         back-line
            y         back-line
            ^Y        back-line
            b         back-screen
            ^B        back-screen
            \ev       back-screen
            \kU  back-screen
            z         forw-window
            w         back-window
            \e\40          forw-screen-force
            F         forw-forever
            \eF       forw-until-hilite
            R         repaint-flush
            r         repaint
            ^R        repaint
            ^L        repaint
            \eu       undo-hilite
            g         goto-line
            \kh  goto-line
            <         goto-line
            \e<       goto-line
            p         percent
            %         percent
            \e[       left-scroll
            \e]       right-scroll
            \e(       left-scroll
            \e)       right-scroll
            {         forw-bracket {}
            }         back-bracket {}
            (         forw-bracket ()
            )         back-bracket ()
            [         forw-bracket []
            ]         back-bracket []
            \e^F      forw-bracket
            \e^B      back-bracket
            G         goto-end
            \e>       goto-end
            >         goto-end
            \ke  goto-end
            =         status
            ^G        status
            :f        status
            /         forw-search
            ?         back-search
            \e/       forw-search *
            \e?       back-search *
            n         repeat-search
            \en       repeat-search-all
            N         reverse-search
            \eN       reverse-search-all
            &         filter
            m         set-mark
            '         goto-mark
            ^X^X      goto-mark
            E         examine
            !         shell
            +         firstcmd
            H         help
            h         help
            V         version
            0         digit
            1         digit
            2         digit
            3         digit
            4         digit
            5         digit
            6         digit
            7         digit
            8         digit
            9         digit
            q         quit
            Q         quit
            :q        quit
            :Q        quit
            ZZ        quit


PRECEDENCE

       Commands  specified  by  lesskey  take precedence over the default com-
       mands.  A default command key may be disabled by including  it  in  the
       input  file  with  the  action  "invalid".  Alternatively, a key may be
       defined to do nothing by using the action  "noaction".   "noaction"  is
       similar to "invalid", but less will give an error beep for an "invalid"
       command, but not for a "noaction" command.  In  addition,  ALL  default
       commands may be disabled by adding this control line to the input file:

       #stop

       This  will  cause  all  default commands to be ignored.  The #stop line
       should be the last line in that section of the file.

       Be aware that #stop can be dangerous.  Since all default  commands  are
       disabled, you must provide sufficient commands before the #stop line to
       enable all necessary actions.  For example, failure to provide a "quit"
       command can lead to frustration.


LINE EDITING SECTION

       The line-editing section begins with the line:

       #line-edit

       This  section specifies new key bindings for the line editing commands,
       in a manner similar to the way key bindings for ordinary  commands  are
       specified  in  the #command section.  The line-editing section consists
       of a list of keys and actions, one per line as in the example below.

            \eh       left
            \kl       left
            \eb       word-left
            \e\kl     word-left
            \ew       word-right
            \e\kr     word-right
            \ei       insert
            \ex       delete
            \kx       delete
            \eX       word-delete
            \ekx      word-delete
            \e\b      word-backspace
            \e0       home
            \kh       home
            \e$       end
            \ke       end
            \ek       up
            \ku       up
            \ej       down
            ^G        abort


LESS ENVIRONMENT VARIABLES

       The environment variable section begins with the line

       #env

       Following  this  line  is  a  list of environment variable assignments.
       Each line consists of an environment variable name, an equals sign  (=)
       and  the value to be assigned to the environment variable.  White space
       before and after the equals sign is  ignored.   Variables  assigned  in
       this  way  are visible only to less.  If a variable is specified in the
       system environment and also in a lesskey file, the value in the lesskey
       file  takes precedence.  Although the lesskey file can be used to over-
       ride variables set in the environment, the main  purpose  of  assigning
       variables  in the lesskey file is simply to have all less configuration
       information stored in one file.


EXAMPLE

       The following input file sets the -i option whenever less is  run,  and
       specifies the character set to be "latin1":

            #env
            LESS = -i
            LESSCHARSET = latin1


SEE ALSO

       less(1)
       or (at your option) any later version.

       lesskey is distributed in the hope that it will be useful, but  WITHOUT
       ANY  WARRANTY;  without even the implied warranty of MERCHANTABILITY or
       FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General  Public  License
       for more details.

       You should have received a copy of the GNU General Public License along
       with lesskey; see the file COPYING.  If not, write to the Free Software
       Foundation, 59 Temple Place, Suite 330, Boston, MA  02111-1307, USA.


AUTHOR

       Mark Nudelman <bug-less@gnu.org>
       Send bug reports or comments to bug-less@gnu.org.

                           Version 458: 04 Apr 2013                 LESSKEY(1)
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