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#compdef basename gbasename
local args variant
_pick_variant -r variant gnu=GNU $OSTYPE --version
case $variant in
gnu)
args=( -s -S -A "-*"
'(2 -a --multiple)'{-a,--multiple}'[support multiple arguments, handling each]'
'(2 -a --multiple -s --suffix)'{-s+,--suffix=}'[remove a trailing suffix]:suffix'
'(-z --zero)'{-z,--zero}'[separate output with NUL rather than newline]'
'(- *)--version[display version information]'
'(- *)--help[display help information]'
)
;;
darwin*|dragonfly*|freebsd*)
args=( -s -S -A "-*"
'(2)-a[support multiple arguments, handling each]'
'(-a 2)-s+[remove a trailing suffix]:suffix'
)
;;
esac
_arguments $args \
'1:file:_files' \
'(*)2:suffix' \
'*:file:_files'
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