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Why number 9 in kill -9 command in unix? [closed]
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Back in the day (by which I mean 4.xBSD or so) you couldn't use the mnemonics with the shell command, which is why the number 9 is written into an awful lot of old dusty-deck shell scripts.
– zwol
Mar 30 '12 at 23:...
Can I set subject/content of email using mailto:?
...es.com/wowhtml/">tell a friend</a>
As alluded to in the comments, both subject and body must be escaped properly. Use encodeURIComponent(subject) on each, rather than hand-coding for specific cases.
As Hoody mentioned in the comments, you can add line breaks by adding the following ...
How to delete a remote tag?
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You just need to push an 'empty' reference to the remote tag name:
git push origin :tagname
Or, more expressively, use the --delete option (or -d if your git version is older than 1.8.0):
git push --delete origin tagname
Note that git has tag namespace and branch namespace so you may u...
How to increase font size in a plot in R?
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You want something like the cex=1.5 argument to scale fonts 150 percent. But do see help(par) as there are also cex.lab, cex.axis, ...
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Check if image exists on server using JavaScript?
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You could use something like:
function imageExists(image_url){
var http = new XMLHttpRequest();
http.open('HEAD', image_url, false);
http.send();
return http.status != 404;
}
Obviously you could use jQuery/similar to p...
Convert NaN to 0 in javascript
Is there a way to convert NaN values to 0 without an if statement:
11 Answers
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What is the “continue” keyword and how does it work in Java?
I saw this keyword for the first time and I was wondering if someone could explain to me what it does.
13 Answers
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Getting an object from an NSSet
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There are several use cases for a set. You could enumerate through (e.g. with enumerateObjectsUsingBlock or NSFastEnumeration), call containsObject to test for membership, use anyObject to get a member (not random), or convert it to an array (in no particular order) with allOb...
Reading/parsing Excel (xls) files with Python
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I highly recommend xlrd for reading .xls files.
voyager mentioned the use of COM automation. Having done this myself a few years ago, be warned that doing this is a real PITA. The number of caveats is huge and the documentation is lacking...
How do I split a string into an array of characters? [duplicate]
...sing normal array syntax. Note, however, that strings are immutable, which means you can't set the value of a character using this method, and that it isn't supported by IE7 (if that still matters to you).
var s = "overpopulation";
console.log(s[3]); // logs 'r'
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