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#compdef zcat
(( $+_is_gnu )) || typeset -gA _is_gnu
if (( ! $+_is_gnu[$words[1]] )); then
if [[ $(_call_program version $words[1] --license </dev/null 2>&1) = *GNU* ]]
then
_is_gnu[$words[1]]=yes
else
_is_gnu[$words[1]]=
fi
fi
if [[ -n "$_is_gnu[$words[1]]" ]]
then
_gzip "$@"
else
_compress "$@"
fi
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