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#!/usr/bin/env sh
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current=$(mktemp '/tmp/until-no-change-currentXXXXXXX')
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prev=$(mktemp '/tmp/until-no-change-prevXXXXXXX')
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sh -c "$1" > "$current"
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while [ -n "$(diff "$current" "$prev")" ]; do
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cp "$current" "$prev"
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sh -c "cat '$prev' | $2 > '$current'"
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done
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cat "${current}"
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