UNEXPAND(1) User Commands UNEXPAND(1) NAME unexpand - convert spaces to tabs SYNOPSIS unexpand [OPTION]... [FILE]... DESCRIPTION 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 AUTHOR Written by David MacKenzie. REPORTING BUGS GNU coreutils online help: Report any translation bugs to COPYRIGHT Copyright (C) 2024 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later . This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO expand(1) Full documentation or available locally via: info '(coreutils) unexpand invocation' GNU coreutils 9.5 March 2024 UNEXPAND(1)