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file permissions with cgi script

PTM: I wrote a script to handle my picture archives and show the
pictures thru web pages.
THe script is with permissions:
-r-xr-xr-x  1 root root 5572 2007-09-20 10:36 album.pl

My perl script creates a file to be included in a html page. It gets
permissions like this:
-rw-r--r--  1 nobody  nobody  113 2007-09-20 08:21 index.txt

Now I would like the script to give write access to group 'users' so
that the file could be edited by for example VI or JOE.
I have tried
$mode = 0666;   chmod $mode, '$txt_file';

It doesn't change the permissions.

The same problem is with the directories. I don't find how to change
permissons of directories in perl running as CGI.

Do you have suggestions ?

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