root/bin/in_place @ 9976
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#!/bin/sh -e
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# Runs a stream command on a file
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# Usage: self file command
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file="$1" |
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shift
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test "$#" -ge 1 || exit 0 # no command to run |
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temp="$(tempfile)" |
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onExit () { rm -f "$temp"; } |
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trap onExit EXIT
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"$@" <"$file" >"$temp" # exits on error so file not updated |
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diff "$file" "$temp" >/dev/null && exit # don't update file if no change |
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case "$(uname)" in Linux) chmod --reference="$file" "$temp";; esac |
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mv "$temp" "$file" |