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executable file 18 lines (16 sloc) 0.335 kb
#!/bin/sh
# usage: ifchange target temporary
target="$1"
temp="$2"
if [ "$temp" = - ]; then
temp="tmpdata$$.tmp~"
cat > "$temp" || exit $?
trap 'rm -f "$temp"' 0
fi
if cmp "$target" "$temp" >/dev/null 2>&1; then
echo "$target unchanged"
rm -f "$temp"
else
echo "$target updated"
mv -f "$temp" "$target"
fi
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