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use warnings;

Use of uninitialized value in string eq at ./delete_list_ver2.pl line 
+27.
Use of uninitialized value in print at ./delete_list_ver2.pl line 37.

    
    # open files, read into array, sort array
    open (ORGLIST, "<", $ARGV[0]);
...
    close (NEWORGLIST);
    
    unlink @orgList; unlink @delList;