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What are file descriptors, explained in simple terms?
...file descriptors, if you open lots of files at once. Which will prevent *nix systems from running, since they open descriptors to stuff in /proc all the time.
– Spencer Rathbun
May 10 '12 at 12:51
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raw vs. html_safe vs. h to unescape html
...is to "revert" an html_safe declaration, pretty unusual.
Prepending your expression with raw is actually equivalent to calling to_s chained with html_safe on it, but is declared on a helper, just like h, so it can only be used on controllers and views.
"SafeBuffers and Rails 3.0" is a nice explana...
Vagrant reverse port forwarding?
...ing vagrant ssh -- -R 12345:localhost:80 This follows the ssh option syntax -R [bind_address:]port:host:hostport, where the first number is the port number to listen on inside the guest machine, and the last two are the service address as visible from the host machine.
– Eero
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Object.getOwnPropertyNames vs Object.keys
... Object.getOwnPropertyNames and Object.keys in javascript? Also some examples would be appreciated.
5 Answers
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Matplotlib: “Unknown projection '3d'” error
I just installed matplotlib and am trying to run one of there example scripts. However I run into the error detailed below. What am I doing wrong?
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What's the point of g++ -Wreorder?
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This should really be the example in the documentation.
– Ben S
Dec 1 '09 at 18:42
3
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Getting Python error “from: can't read /var/mail/Bio”
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No, it's not the script, it's the fact that your script is not executed by Python at all. If your script is stored in a file named script.py, you have to execute it as python script.py, otherwise the default shell will execute it and it will bail out at the from keyword. (Incidentally, fr...
Make xargs execute the command once for each line of input
How can I make xargs execute the command exactly once for each line of input given?
It's default behavior is to chunk the lines and execute the command once, passing multiple lines to each instance.
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Is there a way to quickly capitalize the variable name in Eclipse
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After you press Alt+Shift+R as mentioned by kostja, you can select the text you want to change, then
Ctrl+Shift+Y for lowercase, or
Ctrl+Shift+X for uppercase.
Mac OS
Cmd+Shift+Y lowercase
Cmd+Shift+X uppercase
There is no intelligence in this. It just blindly changes the case on the selec...
How to quit a java app from within the program
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You can use System.exit() for this purpose.
According to oracle's Java 8 documentation:
public static void exit(int status)
Terminates the currently running Java Virtual Machine. The argument serves as a status code; by convention, a nonzero st...