# unexpand
# Convert spaces to tabs.
# More information: <https://www.gnu.org/software/coreutils/unexpand>.
# Convert blanks in each file to tabs, writing to standard output:
unexpand path/to/file
# Convert blanks to tabs, reading from standard output:
unexpand
# Convert all blanks, instead of just initial blanks:
unexpand -a 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 number path/to/file
$
cheat.sh
tldr