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What is a mutex?
...chicken you cannot speak. You can only indicate that you want the chicken and wait until you get it before you speak. Once you have finished speaking, you can hand the chicken back to the moderator who will hand it to the next person to speak. This ensures that people do not speak over each other...
How to compile a static library in Linux?
...e into a file named out.a. Is it sufficient to simply compile with the command gcc -o out.a out.c ? I'm not quite familiar with gcc , hope anyone can give me a hand.
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How to avoid “Permission denied” when using pip with virtualenv
...env permission problems might occur when you create the virtualenv as sudo and then operate without sudo in the virtualenv.
As found out in your question's comment, the solution here is to create the virtualenv without sudo to be able to work (esp. write) in it without sudo.
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SQL join on multiple columns in same tables
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Join like this:
ON a.userid = b.sourceid AND a.listid = b.destinationid;
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Find the number of columns in a table
...N_SCHEMA.COLUMNS
WHERE table_catalog = 'database_name' -- the database
AND table_name = 'table_name'
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Ruby: Calling class method from instance
...le this is the right answer, it's a shame that "self.class" is more typing and less easy to read than the class name "Truck". oh well....
– Matt Connolly
Jan 11 '12 at 11:18
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Is there a way to “autosign” commits in Git with a GPG key?
...e a requirement that I use the same form of my name in
my git repository and my gpg key.
Further I might have multiple keys in my keyring, and might want to use one that doesn't match up with the address I use in commit messages.
This patch adds a configuration entry "user.signingKey" which...
How do I see the current encoding of a file in Sublime Text?
...or re-open the file in a different encoding.
– Immo Landwerth
Dec 22 '13 at 23:45
4
I don't have ...
How to break out or exit a method in Java?
...case, a return statement can be used to branch out of a control flow block and exit the method and is simply used like this:
return;
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How to pass data from 2nd activity to 1st activity when pressed back? - android
I've 2 activities, Activity1 and Activity2 .
9 Answers
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