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