> -----Original Message----- > From: Bryan R Harris [mailto:[EMAIL PROTECTED]] > Sent: Tuesday, June 11, 2002 11:50 AM > To: [EMAIL PROTECTED] > Subject: RE: passing an empty string to a perl script via command line > > > > Interesting! It looks like my problem comes from the way I'm reading > arguments off the command line. I've been using: > > $match = shift || die("Usage: rename match-expr > replace-expr [filenames] > \n example: rename txt html *.txt\n"); > $replace = shift || die("Usage: rename match-expr replace-expr > [filenames]\n example: rename txt html *.txt\n"); > > Apparently the shift pulls off the empty string just fine > (passed using two > single quotes ''), but it doesn't return a 1 for the empty > string, so the > script "dies". > > I'm a little vague on the fix, is it immediately clear to someone?
The following are "false": undef, '', and '0'. Everything else is "true". So you'll have a problem if the replacement string is '0' as well. Use defined() instead. This is only false for undef. defined($replace = shift) or die "blah blah..."; -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
