unexpand — Convert spaces to tabs. More information: <https://www.gnu.org/software/coreutils/manual/html_node/u

Convert blanks in each file to tabs, writing to `stdout`

unexpand {{path/to/file}}

Convert blanks to tabs, reading from `stdout`

unexpand

Convert all blanks, instead of just initial blanks

unexpand {{[-a|--all]}} {{path/to/file}}

Convert only leading sequences of blanks (overrides -a)

unexpand --first-only {{path/to/file}}

Have tabs a certain number of characters apart, not 8 (enables -a)

unexpand {{[-t|--tabs]}} {{number}} {{path/to/file}}