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What does `kill -0 $pid` in a shell script do?
... 0 to a given PID just checks if any process with the given PID is running and you have the permission to send a signal to it.
For more information see the following manpages:
kill(1)
$ man 1 kill
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If sig is 0, then no signal is sent, but error checking is still performed.
...
kill(2)
$ man...
How to view file history in Git?
...pecifier that is a hash key (e.g. 14b8d0982044b0c49f7a855e396206ee65c0e787 and b410ad4619d296f9d37f0db3d0ff5b9066838b39). To view the difference between two different commits, use git diff with the first few characters of the revision specifiers of both commits, like so:
# diff between commits 14b8...
jQuery: Check if div with certain class name exists
...uery can use to do the selection. Here's a test case where the div exists, and here's one where it doesn't exist.
– T.J. Crowder
Apr 26 '11 at 6:10
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How to tell bash that the line continues on the next line
... may be used to remove any special meaning
for the next character read and for line continuation.
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Protected methods in Objective-C
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Lee - if you declare a function pointer in @protected and assign a function in init method would it work?
– bikram990
Mar 11 '14 at 3:36
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Converting from Integer, to BigInteger
...eger.valueOf(myInteger.intValue());
Making a String first is unnecessary and undesired.
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How can I save an image with PIL?
...(PIL) using a post I found earlier to perform fourier transforms of images and I can't get the save function to work. The whole code works fine but it just wont save the resulting image:
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Android Studio Multi-Windows for One Project
I'm wondering if anyone knows how to open two windows of Android Studio with both having the same project. I know you can drag tabs out, but that allows you to only edit that one file. I want two fully-featured windows with each being able to see the Project Files/Structure.
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How to create custom exceptions in Java? [closed]
... it:
public void calculate(int i) throws FooException, IOException;
... and code calling this method must either handle or propagate this exception (or both):
try {
int i = 5;
myObject.calculate(5);
} catch(FooException ex) {
// Print error and terminate application.
ex.printStackTrace()...
Unable to Connect to GitHub.com For Cloning
...t repository , but I am getting the following message when I enter the command in my Git Bash:
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