Re: perl 'read only' situation -- bizarre!

[will trillich <will@serensoft.com>]

On Mon, Jan 06, 2003 at 03:36:20PM -0800, Bill Moseley wrote:
> On Mon, 6 Jan 2003, will trillich wrote:
> > 	my @c = map {s/(.)/$1$1/g; $_} qw(fc0 066 ffc 600 cff 090 ccc 666 fc9 633 cff 096 c9c 090);
> > 
> > under potato, there was no problem. with woody, i've got
> > 
> > 	"Modification of a read-only value attempted"
> 
> It's because $_ is an alias to the current element in your list, which is
> a constant. 
> 
> Notice:
> 
> $ perl -le '$x = 3;my @c = map {$_=6; $_} ($a);  print $a'
> 6

you mean,
	$a = 3; ...
:)

> See, $_ is an alias.

i can see that -- apparently that changed in perl 5.6 ...

-- 
I use Debian/GNU Linux version 3.0;
Linux server 2.2.17 #1 Sun Jun 25 09:24:41 EST 2000 i586 unknown
 
DEBIAN NEWBIE TIP #113 from Sebastiaan <S.Breedveld@ITS.TUDelft.NL>
:
To CHANGE FROM FIXED TO DYNAMIC IP ADDRESS is simple:
just edit /etc/network/interfaces and if eth0 is the interface
to change, use:
	iface eth0 inet dhcp
That should work. See 'man interfaces' for more information.

Also see http://newbieDoc.sourceForge.net/ ...