From: Kaz Kylheku <920-082-4242@kylheku.com>
To: cygwin@cygwin.com
Subject: Re: How to repeat a bash shell script until success
Date: Fri, 14 Jul 2017 17:34:00 -0000 [thread overview]
Message-ID: <f5f430ae9099269d19a00df239644c1d@mail.kylheku.com> (raw)
In-Reply-To: <97021E71-D804-42AF-8358-6276AF4514AB@gmail.com>
On 12.07.2017 08:35, Bryan Dunphy wrote:
> I have a shell script, originally created for Mac OS X. that waits for
> an external drive to be mounted (by testing an âlsâ of the volumeâs
> root directory for success) then runs an ârsyncâ
> command. How do I get the script to be run repeatedly until
> successful exit under Cygwin?
Multi-line
while ! program arg1 arg2 ...
do
: # explicit null statement: syntactically mandatory!
done
one-liner: semicolon between program and "do",
semicolon between : statement and "done":
while ! program arg1 arg2 ... ; do : ; done
The space between ! and the command is required.
I would throw a sleep in there, not to create a CPU-intensive
busy loop:
while ! program args ... ; do
sleep 1
done
--
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next prev parent reply other threads:[~2017-07-14 17:07 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-14 0:16 Bryan Dunphy
2017-07-14 1:12 ` Brian Inglis
2017-07-14 5:31 ` Gary Johnson
2017-07-14 13:06 ` Gary Johnson
2017-07-14 17:07 ` cyg Simple
2017-07-15 18:40 ` Sorin Adrian Savu
2017-07-17 17:41 ` cyg Simple
2017-07-17 17:46 ` Ian Lambert via cygwin
2017-07-14 17:34 ` Kaz Kylheku [this message]
2017-07-14 19:20 ` Brian Inglis
2017-07-14 19:23 Kaz Kylheku
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