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Kill process by name?
I'm trying to kill a process (specifically iChat). On the command line, I use these commands:
15 Answers
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How can i get the session object if i have the entity-manager
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So with Hibernate as JPA 2.0 implementation (see 3.15. Native Hibernate API), you would do:
Session session = entityManager.unwrap(Session.class);
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urlencode vs rawurlencode?
...php.net/manual/en/function.rawurlencode.php)
Returns a string in which all non-alphanumeric characters except -_.~ have been replaced with a percent (%) sign followed by two hex digits. This is the encoding described in » RFC 3986 for protecting literal characters from being interpreted as spec...
Remove a HTML tag but keep the innerHtml
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$('b').contents().unwrap();
This selects all <b> elements, then uses .contents() to target the text content of the <b>, then .unwrap() to remove its parent <b> element.
For the greatest performance, always go native:
var b = document.getElement...
Iterating through a JSON object
..._raw= raw.readlines()
json_object = json.loads(json_raw[0])
you should really just do:
json_object = json.load(raw)
You shouldn't think of what you get as a "JSON object". What you have is a list. The list contains two dicts. The dicts contain various key/value pairs, all strings. When you do j...
How is a CRC32 checksum calculated?
... 1 0000 0100 1100 0001 0001 1101 1011 0111
The highest term (x32) is usually not explicitly written, so it can instead be represented in hex just as
0x 04 C1 1D B7
Feel free to count the 1s and 0s, but you'll find they match up with the polynomial, where 1 is bit 0 (or the first bit) and x ...
SPAN vs DIV (inline-block)
...turn and have default margin.
Note that inline-block is not supported in all browsers. For instance in Firefox 2 and less you must use:
display: -moz-inline-stack;
which displays slightly different than an inline block element in FF3.
There is a great article here on creating cross browser inl...
String concatenation: concat() vs “+” operator
...then throwing it away when you create the final String. In practice memory allocation is surprisingly fast.
Update: As Pawel Adamski notes, performance has changed in more recent HotSpot. javac still produces exactly the same code, but the bytecode compiler cheats. Simple testing entirely fails bec...
How to rename with prefix/suffix?
...available and you have to rename more than one file, shell scripting can really be short and simple for this. For example, to rename all *.jpg to prefix_*.jpg in the current directory:
for filename in *.jpg; do mv "$filename" "prefix_$filename"; done;
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Error to install Nokogiri on OSX 10.9 Maverick?
I upgraded my OSX (Lion) to Mavericks and I can't install Nokogiri for my projects.
30 Answers
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