/usr/share/fish/completions/combine.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 combine -d 'Combine sets of lines from two files using boolean operations'
complete -c combine -a and -d 'Output lines that are in both files'
complete -c combine -a not -d 'Output lines that are inf file1 but not in file2'
complete -c combine -a or -d 'Output lines that are in file1 or in file2'
complete -c combine -a xor -d 'Output lines that are in either file1 or file2, but not in both files'
complete -c combine -a - -d 'Read file from stdin'
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