root/bin/in_place @ 1998
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#!/bin/sh
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# Runs a stream command on a file
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# Usage: self file command
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file="$1" |
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shift
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temp="$(tempfile)" |
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trap "rm -f $temp" EXIT |
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"$@" <"$file" >"$temp" || exit |
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diff "$file" "$temp" >/dev/null && exit # don't update file if no change |
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mv "$temp" "$file" |