/usr/share/fish/completions/root.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 | complete -c root -s b -d 'Run in batch mode'
complete -c root -s n -d 'Do not execute logon and logoff macros'
complete -c root -s q -d 'Exit after processing commandline macro files'
complete -c root -s l -d 'Do not show splashscreen'
complete -c root -s x -d 'Exit on exception'
complete -c root -s h -s \? -l help -d 'Print help'
complete -c root -o config -d 'Print ./configure options'
complete -c root -o memstat -d 'Run with memory usage monitoring'
complete -c root -a "(__fish_complete_suffix .root)"
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