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Check if an apt-get package is installed and then install it if it's not on Linux
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To check if packagename was installed, type:
dpkg -s <packagename>
You can also use dpkg-query that has a neater output for your purpose, and accepts wild cards, too.
dpkg-query -l <packagename>
To find what package owns the command, try:
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What are the relationships between Any, AnyVal, AnyRef, Object and how do they map when used in Java
I usually end up trying every combination until it compiles. Can somebody explain what I should use where?
3 Answers
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How to interpret API documentation function parameters?
...a way as to confuse perennial newbs / hackers / DIYers like myself?
It's really not meant to be written that way. I'll agree there seems to be no ease of use across API documentations. However, there is a lot of cross over from older man style syntax conventions, to the modern API/namespace conventi...
WCF ServiceHost access rights
...ur user ("NT AUTHORITY\NETWORK SERVICE", if that's what your service's installer is set to.
– Mike Pateras
Jun 15 '10 at 1:58
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How to change Android Studio's editor font?
... something else. I go into Editor > Colors & Fonts > Font but all the options are greyed out. For Editor Font it shows Show only monospaced fonts as checked with Primary font as Monospaced, but neither of these can be changed. I tried changing the font under Appearance but tha...
Ignore mouse interaction on overlay image
...rounds set that are being used as containers for other items (that you actually do want to hit-test.)
– Armentage
Feb 8 '12 at 5:22
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Get the generated SQL statement from a SqlCommand object?
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Nice job actually trying to tackle the problem here, up-voted for effort alone.
– Adam Tolley
Apr 5 '11 at 15:36
3
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How to override to_json in Rails?
...ould be separate from the rendering of the json.
Now, anytime to_json is called on an object, as_json is invoked to create the data structure, and then that hash is encoded as a JSON string using ActiveSupport::json.encode. This happens for all types: object, numeric, date, string, etc (see the Act...
iPhone and OpenCV
... now (since 2012) has an official port for the iPhone (iOS).
You can find all of OpenCV's releases here.
And find install instructions here:
Tutorials & introduction for the new version 3.x
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How to detect the device orientation using CSS media queries?
...n portrait orientation will cause the viewport to become wider than it is tall, thereby causing the browser to use landscape styles instead of portrait.
– Johann Combrink
Mar 10 '17 at 8:58
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