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How to delete history of last 10 commands in shell?
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sometimes it's kept in memory and any manual editing wont be persisted after next login..
– superhero
Sep 15 '16 at 8:39
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Polymorphism in C++
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Understanding of / requirements for polymorphism
To understand polymorphism - as the term is used in Computing Science - it helps to start from a simple test for and definition of it. Consider:
Type1 x;
Type2 y;
f(x);
f(y);
Here,...
What is the most elegant way to remove a path from the $PATH variable in Bash?
...ally, how do I remove an item from a colon-separated list in a Bash environment variable?
33 Answers
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Is it a good practice to use an empty URL for a HTML form's action attribute? (action=“”)
...ute altogether. If you leave it out, the form will be submitted to the document's address, i.e. the same page.
It is also possible to leave it empty, and any browser implementing HTML's form submission algorithm will treat it as equivalent to the document's address, which it does mainly because that...
Get to UIViewController from UIView?
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Since this has been the accepted answer for a long time, I feel I need to rectify it with a better answer.
Some comments on the need:
Your view should not need to access the view controller directly.
The view should instead be independent of the view controller, and be able ...
CSS3 gradient background set on body doesn't stretch but instead repeats?
...00%;
margin: 0;
background-repeat: no-repeat;
background-attachment: fixed;
}
Edit: Added margin: 0; to body declaration per comments (Martin).
Edit: Added background-attachment: fixed; to body declaration per comments (Johe Green).
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How do you query for “is not null” in Mongo?
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This will return all documents with a key called "IMAGE URL", but they may still have a null value.
db.mycollection.find({"IMAGE URL":{$exists:true}});
This will return all documents with both a key called "IMAGE URL" and a non-null value.
db.mycoll...
android asynctask sending callbacks to ui [duplicate]
...ack to my activity.
Is it possible? Or does the asynctask must be in the same class file as the activity?
4 Answers
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Is there a list of Pytz Timezones?
I would like to know what are all the possible values for the timezone argument in the Python library pytz. How to do it?
7...
Search text in fields in every table of a MySQL database
...ng through was setup obscurely and I couldn't figure out what the column name or table would be for sure just by looking...
– DrCord
Jan 1 '14 at 19:14
12
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