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Can grep show only words that match search pattern?
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How to check if a variable is set in Bash?
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Using a simple [ -z $var ] is no more "wrong" than omitting quotes. Either way, you're making assumptions about your input. If you are fine treating an empty string as unset, [ -z $var ] is all you need.
– nshew
May 5 '...
SHA1 vs md5 vs SHA256: which to use for a PHP login?
...HA256 which I read about in another stackoverflow article. Are any of them more secure than others? For SHA1/256, do I still use a salt?
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Stash only one file out of multiple files that have changed with Git?
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What is the difference between background and background-color
...background-color, using the background shorthand you could also add one or more values without repeating any other background-* property more than once.
Which one to choose is essentially up to you, but it could also depend on specific conditions of your style declarations (e.g if you need to overr...
Accessing the index in 'for' loops?
...r idx, val in enumerate(ints):
print(idx, val)
Check out PEP 279 for more.
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What are the advantages of using the C++ Boost libraries? [closed]
...ircular buffers
config utils
generic image library
TR1
threads
uBLAS
and more when you code in C++, have a look at Boost.
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Most Useful Attributes [closed]
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Multiple aggregations of the same column using pandas GroupBy.agg()
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