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#! /bin/bash
# Run given command application and update the contents of a given file.
# Will not change the file if its contents has not changed.
[[ $# -gt 1 ]] || { echo "Usage: ${0##*/} FILE COMMAND" >&2; exit 1; }
set -u
declare -r outfile="$1"
shift
if [[ ! -f $outfile ]]; then
$@ >$outfile
exit
fi
declare -r newout=${outfile}.new
$@ >$newout
rc=$?
if cmp -s $newout $outfile; then
rm $newout
else
mv -f $newout $outfile
fi
exit $rc
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