On 27Apr2013 16:41, Mike Wright <mike.wright(a)mailinator.com> wrote:
| 04/27/2013 03:49 PM, Cameron Simpson wrote:
| >On 26Apr2013 09:12, Patrick O'Callaghan <pocallaghan(a)gmail.com> wrote:
| >| On Fri, 2013-04-26 at 15:36 +0300, Cristian Sava wrote:
| >| > [ "z$WEBALIZER_CRON" != "zyes" ] && exit 0
[...]
| >| The "z$Foo" != "zbar" style is idiomatic in Shell scripts. I
think it's
| >| to ensure portability between Shells with slightly different expression
| >| rules.
| >
| >In particular it avoids issues where $WEBALIZER_CRON looks like a test
| >operator such as "-z" or something unfortunate.
|
| Also there may be situations where $SOME_VAR evaluates to null.
| Then a test looks like [ != "something" ] which is guaranteed to
| break.
It's quoted. That will stop it vanishing.
--
Cameron Simpson <cs(a)zip.com.au>
rap on ...
http://slashdot.org/comments.pl?sid=10504&cid=439201