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/sbin/fsck.btrfs is in btrfs-tools 3.12-1.

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#!/bin/sh -f

AUTO=false
while getopts ":aApy" c
do
	case $c in
	a|A|p|y)	AUTO=true;;
	esac
done
eval DEV=\${$#}
if [ ! -e $DEV ]; then
	echo "$0: $DEV does not exist"
	exit 8
fi
if $AUTO; then
	echo "$0: Btrfs file system."
else
	echo "If you wish to check the consistency of an unmounted"
	echo "btrfs filesystem or recover files from or repair a"
        echo "damaged filesystem, see btrfs check and btrfs restore help"
	echo "output."
fi
exit 0