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#!/bin/sh
candidate="$1" # ignored
gzip="$(which gzip)"
if [ ! -x "${gzip}" ]; then
# echo nothing: no suitable gzip found
exit 1
fi
# gzip displays its version string on stdout
# pigz displays its version string on stderr
version="$("${gzip}" --version 2>&1)"
case "${version}" in
(*pigz*)
# echo nothing: no suitable gzip found
exit 1
;;
esac
printf "%s" "${gzip}"
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