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 (enables -a)

--help

display this help and exit

--version

output version information and exit

The full documentation for unexpand is maintained as a Texinfo manual. If the info and unexpand programs are properly installed at your site, the command

info unexpand

should give you access to the complete manual.