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What is the difference between \r and \n?
... Mac, but I'm not sure exactly how they're different, and which to search for/match in regexes.
9 Answers
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Shell - Write variable contents to a file
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Use the echo command:
var="text to append";
destdir=/some/directory/path/filename
if [ -f "$destdir" ]
then
echo "$var" > "$destdir"
fi
The if tests that $destdir represents a file.
The > appends the text after truncating the file. If you only want to append the text in $va...
Why does an overridden function in the derived class hide other overloads of the base class?
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Judging by the wording of your question (you used the word "hide"), you already know what is going on here. The phenomenon is called "name hiding". For some reason, every time someone asks a question about why name hiding happens, people who...
How to check if a process id (PID) exists
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To check for the existence of a process, use
kill -0 $pid
But just as @unwind said, if you're going to kill it anyway, just
kill $pid
or you will have a race condition.
If you want to ignore the text output of kill and do someth...
How to use PrimeFaces p:fileUpload? Listener method is never invoked or UploadedFile is null / throw
...ts apply to all PrimeFaces versions:
The enctype attribute of the <h:form> needs to be set to multipart/form-data. When this is absent, the ajax upload may just work, but the general browser behavior is unspecified and dependent on form composition and webbrowser make/version. Just always sp...
Circular gradient in android
...droid:type="radial" android:gradientRadius="250dp"
android:startColor="#E9E9E9" android:endColor="#D4D4D4" />
</shape>
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Download a specific tag with Git
...m trying to figure out how I can download a particular tag of a Git repository - it's one version behind the current version.
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What does 'useLegacyV2RuntimeActivationPolicy' do in the .NET 4 config?
While converting a project that used SlimDX, and therefore has unmanaged code, to .NET 4.0 I ran into the following error:
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How can I use a search engine to search for special characters? [closed]
... most special characters from the text they index so it's not a good tool for many troubleshooting-related tasks, such as finding out what the variable "$-" is in perl, or searching for error output that is loaded with special characters.
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How to adjust an UIButton's imageSize?
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If I understand correctly what you're trying to do, you need to play with the buttons image edge inset. Something like:
myLikesButton.imageEdgeInsets = UIEdgeInsets(top, left, bottom, right)
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