date math -- Industry guru Dave Taylor answers questions about a wide variety of technical topics, including HTML, online advertising, Cascading Style Sheets, Web design, Unix, Linux, search engine optimization, Mac OS X, shell script programming and Microsoft Windows.

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How many Friday the 13ths are there in a given year?

I'm studying Unix, and i need help writing a script. The script requires that it outputs the number of months and years from January 2007 to December 2017 inclusive that have a Friday the thirteenth....

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How can I time portions of a Linux shell script?

Just picked up your book Wicked Cool Shell Scripts and already have one quick question: While working on the startup scripts, I would like to place log timers at certain portions of scripts. Is it possible to log point A...

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