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UNIX / Linux: awk Add Two Numbers

How do I add two numbers using awk? How do I calculate all incoming number stream on fly and display the total using awk?
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PHP: Verify And Sanitize Email Address

Q. How do I verify input data such as email address under PHP programming language?
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What Are Linux / UNIX Shells?

Can you explain me UNIX shell? What are Shells?
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How to access MySQL database using Perl

Q. How do I access my MySQL database server using Perl programming language?
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