| #!/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}" |