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Is double square brackets [[ ]] preferable over single square brackets [ ] in Bash?
... and is generally safer to use. But it is not portable - POSIX doesn't specify what it does and only some shells support it (beside bash, I heard ksh supports it too). For example, you can do
[[ -e $b ]]
to test whether a file exists. But with [, you have to quote $b, because it splits the argum...
How to get back to most recent version in Git?
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When you checkout to a specific commit, git creates a detached branch. So, if you call:
$ git branch
You will see something like:
* (detached from 3i4j25)
master
other_branch
To come back to the master branch head you just need to checkout ...
How to 'grep' a continuous stream?
...(on Ubuntu 14.04, GNU grep version 2.16). Where is the "use line buffering if stdout is a tty" logic implemented? In git.savannah.gnu.org/cgit/grep.git/tree/src/grep.c, line_buffered is set only by the argument parser.
– Aasmund Eldhuset
Jan 9 '17 at 22:21
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Where Is Machine.Config?
...rop in replacements so don't have their own framework directories. Oh, and if you're unlucky enough to still be using .NET 1.1 then there may be a Framework/v1.1.4322 directory.
– Scott Lerch
May 19 '14 at 21:29
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Prevent Default on Form Submit jQuery
...() {
$('form').on('submit', function(e){
// validation code here
if(!valid) {
e.preventDefault();
}
});
});
Cite: https://api.jquery.com/on/
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Convert integer into byte array (Java)
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this would work well if the bytebuffer is already there... otherwise it seems like it would take longer to do the allocation, than to just allocate a byte array of length 4 and do the shifting manually... but we're probably talking about small di...
How to initialize const member variable in a class?
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The const variable specifies whether a variable is modifiable or not. The constant value assigned will be used each time the variable is referenced. The value assigned cannot be modified during program execution.
Bjarne Stroustrup's explanation su...
Free space in a CMD shell
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If you run "dir c:\", the last line will give you the free disk space.
Edit:
Better solution: "fsutil volume diskfree c:"
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On localhost, how do I pick a free port number?
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Do not bind to a specific port, or bind to port 0, e.g. sock.bind(('', 0)). The OS will then pick an available port for you. You can get the port that was chosen using sock.getsockname()[1], and pass it on to the slaves so that they can connect...
Write a number with two decimal places SQL server
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If this was the answer 10 years ago it isn't any more. This method would turn 10.11111 into 10.00.
– Jonathon Cowley-Thom
Aug 8 '19 at 12:31
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