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Re: How to repeat a bash shell script until success
On Fri, Jul 14, 2017 at 4:06 PM, cyg Simple <email@example.com> wrote:
> On 7/14/2017 1:27 AM, Gary Johnson wrote:
> > On 2017-07-12, 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 “ls” of the
> >> volume’s root directory for success) then runs an “rsync” command.
> >> How do I get the script to be run repeatedly until successful exit
> >> under Cygwin?
> >> Here is the unmodified Mac OS version of the script:
> >> #!/bin/bash
> >> if ls /Volumes/Shared >/dev/null 2>/dev/null
> >> then
> >> rsync -avz --compress-level=9 --delete-during --partial --exclude 'cache/' aleph.gutenberg.org::gutenberg /Volumes/Shared/Project-Gutenberg
> >> exit 0
> >> else
> >> exit 1
> >> fi
> > Let the name of your script be "myscript". The following will run
> > myscript every two seconds until it succeeds.
> > while ! myscript; do sleep 2; done
> > This is really a bash programming question and is not specific to
> > Cygwin.
> In reality the OP script appears to be executed in a crontab system and
> executed every X minutes. So a change to the OP question is needed
> which is answered at. Let's remember some people have no real clue
> as to what question they should ask and we need to interpret what is
> being asked into what should have been asked. If interpretation isn't
> possible then asking for a use case would be warranted.
Actually, the correct question would be: how do I run a bash script
when a USB stick is mounted ?
Which is doable via Task Scheduler and a event log trigger. See
on how to locate the appropriate event,
As for the script:
- don't use ls for checking file/directory presence use -f/-d (man test)
- you will need to adjust paths (cygwin has windows drives under
/cygdrive (cygpath -h)
On how to run the script from Task Scheduler use an action like this:
C:\Tools\cygwin64\bin\bash.exe -c /cygdrive/c/tools/cygwin64/home/bryan/bkp.sh
(adjust your paths accordingly )
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