root/bin/waitpid @ 6766
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#!/bin/sh
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# Waits for process(es), which don't need to be owned by the current shell.
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# Usage: env [interval=...] self PID...
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: "${interval=60}" # s |
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for pid in "$@"; do |
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while test -e "/proc/$pid"; do sleep "$interval"; done |
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done
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