The general mantra here in reply to this sort of question is: 'What have you tried?'. We like to see at least a little effort before someone asks for a solution to their problem. However, to get you started:

Read the various Tutorial articles about regular expressions and calling other applications. If you are still in trouble after that, come back to us with some code and ask another question. Read I know what I mean. Why don't you? for some hints on writing good sample code for a question.

DWIM is Perl's answer to Gödel

In reply to Re: total time usage by day with last by GrandFather
in thread total time usage by day with last by Anonymous Monk

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