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#!/usr/bin/env bash
# This file is part of the OpenADK project. OpenADK is copyrighted
# material, please see the LICENCE file in the top-level directory.
if [ -x /usr/bin/sha256sum ]; then
/usr/bin/sha256sum "$@"
elif [ -x /bin/cksum ] && [ $(echo | cksum -a sha256) = 01ba4719c80b6fe911b091a7c05124b64eeece964e09c058ef8f9805daca546b ]; then
# we assume the arguments are exactly "-c" or "-c -"
x=$(sed 's/^\([0-9a-fA-F]*\) *\([^ ].*\)$/SHA256 (\2) = \1/' | cksum -c -a sha256)
[[ $x = *FAILED* ]] && exit 1
exit 0
else
tmp=$(mktemp -t yyy)
cat - > $tmp
shasum -a 256 "$@" $tmp
fi
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