unexpand - convert spaces to tabs

       Written by David MacKenzie.

       Copyright  ©  2024  Free  Software  Foundation,  Inc.   License  GPLv3+:  GNU  GPL  version  3  or  later
       <https://gnu.org/licenses/gpl.html>.
       This  is  free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent
       permitted by law.

       Convert blanks in each FILE to tabs, writing to standard output.

       With no FILE, or when FILE is -, read standard input.

       Mandatory arguments to long options are mandatory for short options too.

       -a, --all
              convert all blanks, instead of just initial blanks

       --first-only
              convert only leading sequences of blanks (overrides -a)

       -t, --tabs=N
              have tabs N characters apart instead of 8 (enables -a)

       -t, --tabs=LIST
              use  comma  separated list of tab positions.  The last specified position can be prefixed with '/'
              to specify a tab size to use after the last explicitly specified tab stop.  Also a prefix  of  '+'
              can  be  used  to align remaining tab stops relative to the last specified tab stop instead of the
              first column

       --help display this help and exit

       --version
              output version information and exit

       unexpand - convert spaces to tabs

       GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
       Report any translation bugs to <https://translationproject.org/team/>

expand(1)

       Full documentation <https://www.gnu.org/software/coreutils/unexpand>
       or available locally via: info '(coreutils) unexpand invocation'

GNU coreutils 9.5                                  April 2025                                        UNEXPAND(1)

unexpand [OPTION]... [FILE]...