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How to create the most compact mapping n → isprime(n) up to a limit N?
...ent a pseudo-prime test based on Fermat's little theorem. If I really want more speed (i.e. avoid O(sqrt(N)) algorithm altogether), I precompute the false positives (see Carmichael numbers) and do a binary search. This is by far the fastest test I've ever implemented, the only drawback is that the r...
Linux/Unix command to determine if process is running?
... "Process is running."
else
echo "Process is not running."
fi
Furthermore, if you would like the list of PIDs, you could easily grep for those as well:
ps cax | grep httpd | grep -o '^[ ]*[0-9]*'
Whose output is the same on Linux and OS X:
3519 3521 3523 3524
The output of the following is...
What is a magic number, and why is it bad? [closed]
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@MarcusJ You could not be more wrong. This is not a matter of opinion, but of hard earned experience, by many programmers. I cannot tell you how many times, over the past 40 years of programming, that I have cursed a previous programmer who didn't def...
Frame Buster Buster … buster code needed
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Determine if variable is defined in Python [duplicate]
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This debate is much more interesting that the answer itself, which by the way is 100% correct and let you handle poor legacy code elegantly.
– e-satis
Mar 31 '10 at 13:46
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How to Sign an Already Compiled Apk
...ore my-release-key.keystore my_application.apk alias_name
check here for more info
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How to select lines between two marker patterns which may occur multiple times with awk/sed
...ion, which is to print $0: if flag is equal 1 the line is printed.
For a more detailed description and examples, together with cases when the patterns are either shown or not, see How to select lines between two patterns?.
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How do I detect when someone shakes an iPhone?
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What is the best way to convert an array to a hash in Ruby
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Is there a null-coalescing (Elvis) operator or safe navigation operator in javascript?
...on it is almost entirely about coffeescript rather than javascript, and is more than half about describing coffeescript benefits unrelated to the OP. I'd suggest boiling it down to just what's relevant to the question, as wonderful as coffeescript's other benefits are.
– jingl...