/usr/share/fish/completions/unexpand.fish is in fish-common 2.4.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | complete -c unexpand -s a -l all -d 'convert all blanks, instead of just initial blanks'
complete -c unexpand -l first-only -d 'convert only leading sequences of blanks (overrides -a)'
complete -c unexpand -s t -l tabs -x -d 'have tabs N characters apart instead of 8 (enables -a)'
complete -c unexpand -s t -l tabs -x -d 'use comma separated LIST of tab positions (enables -a)'
complete -c unexpand -l help -d 'display this help and exit'
complete -c unexpand -l version -d 'output version information and exit'
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