Re^3: how to run this script (permissions)

[toolic]

when i do ./filename it gives error bash: ./test.pm: Permission denied

You probably need to give your test.pm file execute permissions, like:

chmod 777 test.pm

Also, conventionally, the .pm file name suffix is reserved for Perl module files (see package). It is more common to use the .pl file extension for scripts.

[johngg]

chmod 777 test.pm

Far too permissive!

That gives every man and his dog permission to run, modify or even delete the script, if they are able to browse to the directory containing it. Much safer would be

chmod u+x test.pm

We see, and have to try to fix, the chaos that ensues when someone does an ill-considered

chmod -R 777 /some/path/with_lots_of/sub-directories

and it is a practice strongly to be discouraged.