This file is indexed.

/usr/share/fish/completions/who.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.

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complete -c who -s a -l all --description "Same as -b -d --login -p -r -t -T -u"
complete -c who -s b -l boot --description "Print time of last boot"
complete -c who -s d -l dead --description "Print dead processes"
complete -c who -s H -l heading --description "Print line of headings"
complete -c who -s i -l idle --description "Print idle time"
complete -c who -s l -l login --description "Print login process"
complete -c who -l lookup --description "Canonicalize hostnames via DNS"
complete -c who -s m --description "Print hostname and user for stdin"
complete -c who -s p -l process --description "Print active processes spawned by init"
complete -c who -s q -l count --description "Print all login names and number of users logged on"
complete -c who -s r -l runlevel --description "Print current runlevel"
complete -c who -s s -l short --description "Print name, line, and time"
complete -c who -s t -l time --description "Print last system clock change"
complete -c who -s T -l mesg --description "Print users message status as +, - or ?"
complete -c who -s w -l writable --description "Print users message status as +, - or ?"
complete -c who -l message --description "Print users message status as +, - or ?"
complete -c who -s u -l users --description "List users logged in"
complete -c who -l help --description "Display help and exit"
complete -c who -l version --description "Display version and exit"