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waitfor.sh
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| PIPE=$(mktemp -d -t pipe.XXXXXX) && mkfifo $PIPE/pipe && exec 3<> $PIPE/pipe && rm -rf $PIPE | |
| OUTPUTTER &>&3 & # substitute OUTPUTTER for the command whose output should be awaited | |
| LOG_PID=$! | |
| grep -m1 "$1" <&3 | |
| kill -SIGTERM $LOG_PID | |
| exec 3<&- #close our pipe |
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