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How to check if a variable is set in Bash?
How do I know if a variable is set in Bash?
33 Answers
33
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What is the advantage of using abstract classes instead of traits?
... performance overhead.
However, you should make this choice only if you know that the trait
in question constitutes a performance bottleneck and have evidence
that using a class instead actually solves the problem.
If you still do not know, after considering the above, then start by
mak...
Differences between MySQL and SQL Server [closed]
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I am sure you know more than me. I am just a beginner can you please let me know if I am mistaken? Is there anything exact as MS SQL?
– Unbreakable
Jul 5 '15 at 12:25
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Why does typeof NaN return 'number'?
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It looks like you are right, @Andy. Now that's a peculiarity.
– Alsciende
Sep 2 '15 at 9:55
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Soft keyboard open and close listener in an activity in Android
... press back then it closes keyboard & but didn't click on other views, now again I click on same edittext which already have focus then what will happen ?
– N Sharma
Sep 12 '14 at 10:17
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Calculating Distance between two Latitude and Longitude GeoCoordinates
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Thanks for a good solution, I can now use it in my Desktop application.
– Jamshaid Kamran
Mar 2 '18 at 15:59
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Where do I use delegates? [closed]
...situations where you need to execute a particular action, but you don’t know in
advance which method, or even which object, you’ll want to call upon
to execute it.
For Example: A button might not know which object or objects need to be notified. Rather than wiring the button to a particular
ob...
How to send a custom http status message in node / express?
...ype = Object.create(Error);
JSONError.prototype.constructor = JSONError;
Now, when I want to throw an Error in the code, I do:
var err = new JSONError(404, 'Uh oh! Can't find something');
next(err);
Going back to the custom error handling middleware, I modify it to:
app.use(function(err, req, ...
Is there a link to GitHub for downloading a file in the latest release of a repository?
... There is no browser_download_url any more. You can use tarball_url now. curl -s https://api.github.com/repos/git-ftp/git-ftp/releases | grep tarball_url | head -n 1 | cut -d '"' -f 4
– maikel
Apr 23 '16 at 7:13
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How to copy a file to multiple directories using the gnu cp command
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Thanks for the answer! Now that I think about it a bit more, without extra flags (which do not exist) cp will not know what is the source and what is the DEST dir.
– Tom Feiner
Oct 12 '08 at 16:39
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