[EMAIL PROTECTED] <> wrote:
> Hi again Gurus!
>
> I am trying to expand my understanding of perl. i do not understand
> why the first test fails and the latter two succeed. shouldn't the
> first succeed as well?
>
> -Josh
>
> code:
>
> #!/usr/bin/perl
> use strict;
>
> # doesn't work
> if(-e "%systemdrive%\\servicedisk\\tools\\seachange\\SeaPatch.exe"){
> print "yes\n"; }else{ print "no\n"; }
That's how you refer to environment variables on the win32 command line,
etc. It means nothing to Perl. I suspect that it is unlikely that you
have a sub-directory of the current working directory named
"%systemdrive%". However, Perl has a special hash called %ENV for
environment variables. You should use that, e.g;
if(-e "$ENV{SYSTEMDRIVE}/servicedisk/tools/seachange/SeaPatch.exe"){
> print "yes\n"; }else{ print "no\n"; }
>
> # work on either versions
>
> my $sysdir=`%systemdrive%`;
> my $file ="$sysdir\\servicedisk\\tools\\seachange\\SeaPatch.exe";
> if(-e $file){ print "yes\n"; }else{ print "no\n"; } if(-e
> "$sysdir\\servicedisk\\tools\\seachange\\SeaPatch.exe"){ print
> "yes\n"; }else{ print "no\n"; }
The above doesn't do what you think it does, it only appears to work by
coincidence. Try printing the contents of $sysdir and $file. You will
see that you are testing the existence of a file called
"\\servicedisk\\tools\\seachange\\SeaPatch.exe".
HTH
--
Brian Raven
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