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unexpand

Convert spaces to tabs. More information: https://www.gnu.org/software/coreutils/manual/html_node/unexpand-invocation.html.

Convert blanks in each file to tabs, writing to standard output:

unexpand {{file}}

Convert blanks to tabs, reading from standard output:

unexpand

Convert all blanks, instead of just initial blanks:

unexpand -a {{file}}

Convert only leading sequences of blanks (overrides -a):

unexpand --first-only {{file}}

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

unexpand -t {{number}} {{file}}