awk

I need to call the function called foo() using echo command in the same statement. How do I all or invoke the function using the echo statement?

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How do I parse my Linux servers IP address using a Bash shell?

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How do I use awk pattern scanning and processing language under bash scripts? Can you provide a few examples?

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How do I a print line after matching /regex/ using awk under Linux / UNIX operating systems? I’d like print the line immediately after a line that matches /regex/ but not the line that matches itself.

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Q. I can append text to a file using >> operator but how do I prepend a text to a file? I want the opposit of >> operation?

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