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Git: How to return from 'detached HEAD' state
...flog to find the hashes of previously checked out commits.
A shortcut command to get to your last checked out branch (not sure if this work correctly with detached HEAD and intermediate commits though) is git checkout -
sha...
How to show particular image as thumbnail while implementing share on Facebook?
...the Facebook Lint page got the image into Facebook.
Enter your URL here and FB will update the metadata from your page:
https://developers.facebook.com/tools/debug (updated link)
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What do the python file extensions, .pyc .pyd .pyo stand for?
...c file that contains the bytecode to make importing it again later easier (and faster).
.pyo: This was a file format used before Python 3.5 for *.pyc files that were created with optimizations (-O) flag. (see the note below)
.pyd: This is basically a windows dll file. http://docs.python.org/faq/win...
ERROR 1044 (42000): Access denied for user ''@'localhost' to database 'db'
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No, you should run mysql -u root -p in bash, not at the MySQL command-line.
If you are in mysql, you can exit by typing exit.
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How do I extract the contents of an rpm?
I have an rpm and I want to treat it like a tarball. I want to extract the contents into a directory so I can inspect the contents. I am familiar with the querying commands of an uninstalled package. I do not simply want a list of the contents of the rpm. i.e.
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How to assign the output of a command to a Makefile variable
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shell is not a standard Make builtin command. This is a GNU Make builtin.
– Dereckson
Feb 18 '14 at 20:17
14
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How do I clear this setInterval inside a function?
Normally, I’d set the interval to a variable and then clear it like var the_int = setInterval(); clearInterval(the_int); but for my code to work I put it in an anonymous function:
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Is it possible to set transparency in CSS3 box-shadow?
...ose rgba() would work here. After all, browser support for both box-shadow and rgba() is roughly the same.
/* 50% black box shadow */
box-shadow: 10px 10px 10px rgba(0, 0, 0, 0.5);
div {
width: 200px;
height: 50px;
line-height: 50px;
text-align: center;
color: white;
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Count the number of occurrences of a string in a VARCHAR field?
...wesome, just what I needed! But note, that LENGTH() is not multi-byte safe and you might run into strange errors. Use CHAR_LENGTH() instead:)
– nico gawenda
Apr 29 '13 at 23:28
1
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Does C++ support 'finally' blocks? (And what's this 'RAII' I keep hearing about?)
...lock()
{
m_.release();
}
};
// A class which uses 'mutex' and 'lock' objects
class foo
{
mutex mutex_; // mutex for locking 'foo' object
public:
void bar()
{
lock scopeLock(mutex_); // lock object.
foobar(); // an operation which may throw an exception
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