$ ls -l pm_1076973.*
-rwxr-xr-x  1 ken  staff  202  5 Mar 08:56 pm_1076973.pl
-rw-r--r--  1 ken  staff   63  5 Mar 08:56 pm_1076973.txt
-rw-r--r--  1 ken  staff   87  5 Mar 08:46 pm_1076973.txt.bak