Re: [Help-bash] how to set up a repeat check procedure?

[Jasper Noë]

On 29-12-11 08:53, lina wrote:
> On Thursday 29,December,2011 03:29 PM, lina wrote:
> > Hi,
> >
> > How can I let a script keep on checking whether a file exist or not?
> >
> > if not, check it again 1 minutes later,
> > if exist, execute some commands,
> >
> > I started writing the
> >
> > #!/bin/sh
> > file=a.txt
> >
> > if [ -e $file ]; then
> > echo "$file exists"
> > else
> > sleep 60
> > ## I don't know how to let it back to check,
> > fi
> >
> >
> > Thanks with best regards,
> The a.txt was the one destined to be generated, but the generation time
> won't be know, which might last from 2 mins to 2 hours,
>
> so I wish there is a script there check whether it's generate or not, if
> generate, so it can proceed further.
>
> It's a bit dynamic process, sort of .. haha ...
>
> Thanks for your advice,
>
> Best regards,

Generally you make a loop like this:

while true; do

        something

done

In this particular case you could write:

until [ -f $file ]; do

        sleep 60

done

Untested, hth, --Jasper.