On Thursday 29 Apr 2010, Uri Guttman wrote:
> i recomment never using !~ as it doesn't read well and it makes for poor
> boolean tests. also i rarely use unless for complex (2 or more) boolean
> ops for the same reason.
>
> APK> { my $result = "OK";
> APK> print "$result\n";
> APK> }
> APK> I thought it was:
> APK> UNLESS $result is defined and UNLESS $test does not contain TEST = IF
> $result is not defined and if $test contains TEST.
>
> no, that is not boolean logic. the && happens first and then the unless
> inverts that for the conditional test. a conditional is always only one
> boolean value that must be derived from the expression. unless/if
> doesn't see the multiple parts.
>
Thank you very much Uri for the explanation. I'd learnt about "Unless" a few
years back, but haven't been into scripting except Shell for the past few years
and may be due to that, lost on that completely. But with you guys' help, I
have polished it back now. :-)
--
Regards,
Akhthar Parvez K
http://Tips.SysAdminGUIDE.COM
UNIX is basically a simple operating system, but you have to be a genius to
understand the simplicity - Dennie Richie
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