/usr/share/fish/completions/entr.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 | complete -c entr -s r -d 'Launches the utility at startup and reloads it if one of the source files change'
complete -c entr -s c -d 'Clears the screen before running the utility'
complete -c entr -s h -l help -d 'Display help and exit'
complete -c entr -s v -l version -d 'Output version information'
complete -c entr -x -a '(__fish_complete_subcommand)'
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