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Message: <blockquote data-quote="Bill R" data-source="post: 889852" data-attributes="member: 69361">for INDEX: @ARGV is an array of command line arguments. Since you only have 1, the filename, its going to be zero in all cases.For SYNTAX:To quote Larry Wall (an important guy if you program perl) "There's more then one way to do it." If your instructor is looking for a specific answer, these may not be it.1: scalar (@ARGV) == 1    #make sure there is exactly one argument2: d  #-d file test is only true if testing a directory3. while # while loop such as that will continue until the end of the file is reached and line is set to a null value (0 or empty string for perl).Also, make sure you close the file handle at the end of the program. Leaving them open, while not necessarily harmful, is not a good practice to be in.</blockquote>