[kwlug-disc] Outsmarted by bash && if
Robert P. J. Day
rpjday at crashcourse.ca
Wed Apr 7 21:23:19 EDT 2010
On Wed, 7 Apr 2010, Lori Paniak wrote:
> Dear very clever list,
> I am trying to write a simple bash script to (re)start a process given
> the logical "and" of two conditions. I think it should look like this:
> if [ -n "$STICK" ] && [ -n "$STATUS" ]; then
> /sbin/ifup ppp0
> When STICK and STATUS are non-empty strings I would like ifup to run.
> This works if I just use one condition, but I cannot figure out the
> correct syntax for the AND-ed case. I've tried (seemingly) all
> combinations and locations of brackets without success.
> Anyone out there care to point out my trivial error(s)?
i'm not sure why it *doesn't* work. if i use hardcoded strings:
$ if [ -n "fred" ] && [ -n "barney" ] ; then
> echo yup
so i'm not sure what the deal is.
Robert P. J. Day Waterloo, Ontario, CANADA
Linux Consulting, Training and Kernel Pedantry.
Web page: http://crashcourse.ca
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