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how to use sed, awk, or gawk to print only what is matched?

I see lots of examples and man pages on how to do things like search-and-replace using sed, awk, or gawk. 11 Answers ...
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Return type of '?:' (ternary conditional operator)

... Expressions don't have return types, they have a type and - as it's known in the latest C++ standard - a value category. A conditional expression can be an lvalue or an rvalue. This is its value category. (This is somewhat of a simplification, in C++11 we have lvalues, xvalues a...
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Download a single folder or directory from a GitHub repo

...s://github.com/lodash/lodash/trunk/test Download the folder. Go to the command line and grab the folder with SVN. svn checkout https://github.com/lodash/lodash/trunk/test You might not see any activity immediately because Github takes up to 30 seconds to convert larger repositories, so be patie...
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What is the JavaScript convention for no operation?

...at is the JavaScript convention for no operation? Like a Python pass command. 6 Answers ...
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SQL Server: Filter output of sp_who2

...MAX), BlkBy VARCHAR(MAX), DBName VARCHAR(MAX), Command VARCHAR(MAX), CPUTime INT, DiskIO INT, LastBatch VARCHAR(MAX), ProgramName VARCHAR(MAX), SPID_1 INT, REQUESTID INT ) INSERT INTO @Table EXEC sp_who2 SELECT * FROM @Tab...
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Why is i++ not atomic?

...crement operation atomic; it involves synchronization at both the software and hardware levels that need not be present in an ordinary increment. You could make the argument that i++ should have been designed and documented as specifically performing an atomic increment, so that a non-atomic increm...
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Getting the closest string match

I need a way to compare multiple strings to a test string and return the string that closely resembles it: 12 Answers ...
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Programmer Puzzle: Encoding a chess board state throughout a game

...e: I liked this topic so much I wrote Programming Puzzles, Chess Positions and Huffman Coding. If you read through this I've determined that the only way to store a complete game state is by storing a complete list of moves. Read on for why. So I use a slightly simplified version of the problem for ...
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How to find what code is run by a button or element in Chrome using Developer Tools

I'm using Chrome and my own website. 5 Answers 5 ...
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How do I match any character across multiple lines in a regular expression?

... and what if i wanted just a new line and not all characters ? – Grace Apr 11 '11 at 12:02 3 ...