Re: Re: perl -s is evil?

[blakem]

in reply to Re: perl -s is evil?
in thread perl -s is evil?

Here's a one liner that exhibits this oddity... 5.6.1 and 5.00503 on linux:

perl -sle 'print $1' -- -1=foo
foo

/usr/local/bin/perl5.6.1 -sle 'print $1' -- -1=foo
foo

/usr/local/bin/perl5.00503 -sle 'print $1' -- -1=foo
foo

Can you replicate this?

-Blake

[buckaduck]

I can replicate that. But more to the point, I also get the following result which is closer to the original post:

(using both Perl 5.6.0 on Win95 and Perl 5.005_02 on Solaris)

% perl -sle '"Hello" =~ /(\w+)/; print $1' -- -1=foo
foo

It's just plain wrong. Not only can $1 be assigned to, but afterward it refuses to take the pattern from the regex.

buckaduck

[jclovs]

Well, just some fooling around with the last statement Re: Re: Re: perl -s is evil? on my linux box runing Perl 5.005_03, I decided to see what taint checking would do to this example. Wwll here's the results:

$ perl -sleT 'use diagnostics; use strict; "Hello" =~ /(\w+)/; print $
+1' -- -1=foo
$

While T in any other position returns

$ perl -sleT 'use diagnostics; use strict; "Hello" =~ /(\w+)/; print $
+1' -- -1=foo
foo
$

Clovs aka jclovs

[blakem]

ummm... You've got a bit of a command like goof there.... The following one-liner illustrates it. Can you figure it out?

perl -weT 'print "I like jellybeans"'
Useless use of a constant in void context at -e line 1.

consult perlrun for hints. ;-)

-Blake