Thanks Zaxo!!!

I was under the impression that args are sent as values through @_ and thought that this problem was something to do with closures. I went back and tried a chomp on simple sub and the same happened. I checked perldoc perlsub and i got this info 

Any arguments passed in show up in the array @_.  Therefore, if you ca
+lled a function with two arguments, those would be stored in $_[0] an
+d $_[1].  The array @_ is a local array, but its elements are aliases
+ for the actual scalar parameters.  In particular, if an element $_[0
+] is updated, the corresponding argument is updated (or an error occu
+rs if it is not updatable).

[download]

Now it is clear to me!

thanks again!

cheers

SK

In reply to Re^2: Modification of read-only value error when using closure by sk
in thread Modification of read-only value error by sk

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