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29 lines
499 B
Bash
29 lines
499 B
Bash
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#!/bin/sh
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set -e
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if [ "$#" -lt "2" ]; then
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echo "USAGE: $0 <file> <cmd...>"
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exit 1
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fi
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DST_FILE="$1"
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shift
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# Just in case:
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mkdir -p -- "$(dirname -- "${DST_FILE}")"
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cleanup()
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{
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rm -f -- "${DST_FILE}.tmp"
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}
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trap cleanup 0 1 2 3 6
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"$@" > "${DST_FILE}.tmp"
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# If we get here, the command was successful, and we can overwrite the destination.
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if ! cmp --quiet -- "${DST_FILE}.tmp" "${DST_FILE}"; then
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# File changed, need to overwrite:
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mv -f -- "${DST_FILE}.tmp" "${DST_FILE}"
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fi
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