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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...
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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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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Passing route control with optional parameter after root in express?
...after in URL construction, I gave a '?' symbol after batchNo '/:batchNo?'
Now I can call with only categoryId and productId or with all three-parameter.
http://127.0.0.1:3000/api/v1/tours/5/10
//or
http://127.0.0.1:3000/api/v1/tours/5/10/8987
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iOS 7 - How to display a date picker in place in a table view?
... "opening" but using the begin and endupdates solved that. Nice and smooth now. Thanks datinc!
– nh32rg
Feb 12 '15 at 1:14
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How to clear the canvas for redrawing
...perimenting with composite operations and drawing images on the canvas I'm now trying to remove images and compositing. How do I do this?
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Web Application Problems (web.config errors) HTTP 500.19 with IIS7.5 and ASP.NET v2
...JAX Extensions was the problem. I commented that section out since AJAX is now built into 3.5
– jdiaz
Dec 3 '09 at 3:09
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OpenSSL and error in reading openssl.conf file
...bles in Windows NT and How To Manage Environment Variables in Windows XP.
Now you can run openssl commands without having to pass the config location parameter.
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