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• Get the first n lines matching a certain pattern (with Linux commands)
• How do I find a date which is three days earlier than a given date in Perl?
• Good way of handling NoneType objects when printing in Python
• How can I join two hashes in Perl without using a loop?
• Wiping out DFS in Hadoop
• How do I compare two hashes in Perl without using Data::Compare?
• How can I split a string into only two parts with Perl?
• How to copy the first few lines of a giant file, and add a line of text at the end of it using some Linux commands?

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