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Allowed characters in Linux environment variable names
...ames shall not contain
the character '='. For values to be
portable across systems conforming to
IEEE Std 1003.1-2001, the value shall
be composed of characters from the
portable character set (except NUL
and as indicated below).
So names may contain any character except = and NUL, but...
Quickly create a large file on a Linux system
...
dd from the other answers is a good solution, but it is slow for this purpose. In Linux (and other POSIX systems), we have fallocate, which uses the desired space without having to actually writing to it, works with most modern disk based file systems, very fast:
For example:
fallocate -l 10G gen...
Keyboard Interrupts with python's multiprocessing Pool
...ever returns, so the interrupt never happens. KeyboardInterrupt should almost certainly interrupt a condition wait.
Note that this doesn't happen if a timeout is specified; cond.wait(1) will receive the interrupt immediately. So, a workaround is to specify a timeout. To do that, replace
res...
Go naming conventions for const
... whether you want to export the constant.
A few examples:
md5.BlockSize
os.O_RDONLY is an exception because it was borrowed directly from POSIX.
os.PathSeparator
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The model used to open the store is incompatible with the one used to create the store
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@Computer_whiz123, in XCode 5.1.1 it is called 'Model Version'
– Stas
Sep 3 '14 at 15:35
1
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What is the most effective way for float and double comparison?
What would be the most efficient way to compare two double or two float values?
31 Answers
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Programmatically set the initial view controller using Storyboards
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123
For all the Swift lovers out there, here is the answer by @Travis translated into SWIFT:
Do w...
Warning: push.default is unset; its implicit value is changing in Git 2.0
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The motive is that, empirically, most expect the new default behavior
– Blake Miller
Jun 15 '13 at 18:53
125
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Best way to store a key=>value array in JavaScript?
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If I understood you correctly:
var hash = {};
hash['bob'] = 123;
hash['joe'] = 456;
var sum = 0;
for (var name in hash) {
sum += hash[name];
}
alert(sum); // 579
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Check if application is on its first run [duplicate]
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123
The accepted answer doesn't differentiate between a first run and subsequent upgrades. Just se...