/usr/share/fish/completions/watch.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 7 8 9 10 11 12 13 | complete -c watch -s b -l beep -d 'Beep if command has a non-zero exit'
complete -c watch -s c -l color -d 'Interpret ANSI color sequences'
complete -c watch -s d -l differences -d 'Highlight changes between updates'
complete -c watch -s d -l differences=permanent -d 'Highlight changes between updates'
complete -c watch -s e -l errexit -d 'Exit if command has a non-zero exit'
complete -c watch -s g -l chgexit -d 'Exit when output from command changes'
complete -c watch -s n -l interval -d 'Seconds to wait between updates' -x
complete -c watch -s p -l precise -d 'Attempt run command in precise intervals'
complete -c watch -s t -l no-title -d 'Turn off header'
complete -c watch -s x -l exec -d 'Pass command to exec instead of "sh -c"'
complete -c watch -s h -l help -d 'Display this help and exit'
complete -c watch -s v -l version -d 'Output version information and exit'
complete -c watch -xa '(__fish_complete_subcommand -- -n --interval)'
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