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Bash

#!/bin/sh
set -e
if [ "$VCS" = git ]; then
[ -d .git ] && [ -n "`git status --porcelain`" ]
elif [ "$VCS" = hg ]; then
[ -d .hg ] && ! hg status 2>&1 | wc -l | grep -q "^0$"
elif [ "$VCS" = bzr ]; then
[ -d .bzr ] && ! bzr version-info --custom --template="{clean}\n" | grep -q "^1$"
elif [ "$VCS" = darcs ]; then
[ -d _darcs ] && darcs whatsnew -l >/dev/null
fi