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$ ls -l pm_user_input_file
ls: pm_user_input_file: No such file or directory

$ perl -Mstrict -Mwarnings -E '
    use autodie qw{:all};
...
q,w,e
a,s,d
z,x,c

$ ls -l pm_user_input_file
-rw-r--r--  1 ken  staff  24 19 Jun 23:49 pm_user_input_file

$ cat pm_user_input_file
1,2,3
q,w,e
a,s,d
z,x,c