Plan 9 from Bell Labs’s /usr/web/sources/contrib/anothy/bin/rc/waitloop

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Distributed under the MIT License.
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#!/bin/rc

# Retry a command with a minimum delay. Avoid chewing up
# the machine on commands with transient failures.

if (test $#* -lt 2) {
	echo 'usage: ' $0 ' seconds command...' >[1=2]
	exit usage
}

sec=$1
shift

while () {
	$* &
	sleep $sec
	wait
}

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