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Sorting multiple keys with Unix sort

... Use the -k option (or --key=POS1[,POS2]). It can appear multiple times and each key can have global options (such as n for numeric sort) share | improve this a...
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Validating IPv4 addresses with regexp

...idation, but without much luck. It seemed at one point I had had it with (25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?(\.|$)){4} , but it produces some strange results: ...
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Split (explode) pandas dataframe string entry to separate rows

... 22 Answers 22 Active ...
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FFMPEG (libx264) “height not divisible by 2

...ing to encode a .mp4 video from a set of frames using FFMPEG using the libx264 codec. 7 Answers ...
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Is it possible to install another version of Python to Virtualenv?

I have a shared account in a web-hosting that has Python 2.4 installed, but my code is not compatible with 2.4. Is it possible to install Python 2.6 directly to Virtualenv? ...
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What's the difference between tilde(~) and caret(^) in package.json?

...u to all future patch versions, without incrementing the minor version. ~1.2.3 will use releases from 1.2.3 to <1.3.0. ^version “Compatible with version”, will update you to all future minor/patch versions, without incrementing the major version. ^2.3.4 will use releases from 2.3.4 to <3....
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What to do about Eclipse's “No repository found containing: …” error messages?

...'s Helios EE bundle on Linux to which I added the subversive plugins, the m2e Maven integration and the Mylin connector for Trac. For the last couple of weeks I've been trying to install updates, and every time I get back a message like ...
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In the shell, what does “ 2>&1 ” mean?

... 2671 File descriptor 1 is the standard output (stdout). File descriptor 2 is the standard error (s...
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RegEx for matching UK Postcodes

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Replace all 0 values to NA

... 252 Replacing all zeroes to NA: df[df == 0] <- NA Explanation 1. It is not NULL what you ...