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#compdef chown chgrp
local suf usr grp req expl
if [[ CURRENT -eq 2 || CURRENT -eq 3 && $words[CURRENT-1] = -* ]]; then
if [[ $service = chgrp ]] || compset -P '*[:.]'; then
if (( EGID && $+commands[groups] )); then # except for root
_wanted groups expl 'group' compadd $(groups) && return 0
fi
_groups && return 0
else
if [[ $OSTYPE = (solaris*|hpux*|*bsd*) ]]; then
suf=':'
else
suf='.'
fi
compset -S '.*' && unset suf
_users -S "$suf" -q && return 0
fi
else
if [[ $service = chgrp ]]; then
grp=${words[CURRENT-1]}
else
usr=${words[CURRENT-1]%%[.:]*}
usr=${${(M)usr:#[0-9]#}:-${userdirs[$usr]:+.$usr.}}
grp=${${(M)words[CURRENT-1]%%[.:]*}#?}
fi
[[ -n $grp ]] && grp="${${(M)grp:#[0-9]#}:-.$grp.}"
req=( ${usr:+\^u$usr} ${grp:+\^g$grp} )
(( EUID )) && req=( u$EUID$^req )
req=( -$^req )
_files -g "*(${(j:,:)req})" && return 0
fi
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