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Catching error codes in a shell pipe
...s:
tmp=${TMPDIR:-/tmp}/mine.$$
trap 'rm -f $tmp.[12]; exit 1' 0 1 2 3 13 15
...if statement as before...
rm -f $tmp.[12]
trap 0 1 2 3 13 15
The first trap line says 'run the commands 'rm -f $tmp.[12]; exit 1' when any of the signals 1 SIGHUP, 2 SIGINT, 3 SIGQUIT, 13 SIGPIPE, or 15 SIGTERM occur, ...
Why does parseInt yield NaN with Array#map?
...,'2','3'].map(function(num) { return parseInt(num, 10); });
or with ES2015+ syntax:
['1','2','3'].map(num => parseInt(num, 10));
(In both cases, it's best to explicitly supply a radix to parseInt as shown, because otherwise it guesses the radix based on the input. In some older browsers, a l...
What does upstream mean in nginx?
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165
It's used for proxying requests to other servers.
An example from http://wiki.nginx.org/LoadBal...
Does the ternary operator exist in R?
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answered Jan 9 '12 at 14:52
kohskekohske
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Is there XNOR (Logical biconditional) operator in C#?
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252
XNOR is simply equality on booleans; use A == B.
This is an easy thing to miss, since equality...
Is there a Python Library that contains a list of all the ascii characters?
...f you want all printable characters:
>>> string.printable
'0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!"#$%&\'()*+,-./:;?@[\\]^_`{|}~ \t\n\r\x0b\x0c'
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What is the default value for enum variable?
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answered Feb 11 '11 at 9:58
BoltClock♦BoltClock
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Shading a kernel density plot between two points.
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What's Go's equivalent of argv[0]?
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145
import "os"
os.Args[0] // name of the command that it is running as
os.Args[1] // first command ...
CSS performance relative to translateZ(0)
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