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How to check if a Unix .tar.gz file is a valid file without uncompressing?
...and throw away the output, rather than decompressing the file?
tar -tzf my_tar.tar.gz >/dev/null
Edited as per comment. Thanks zrajm!
Edit as per comment. Thanks Frozen Flame! This test in no way implies integrity of the data. Because it was designed as a tape archival utility most implementa...
Unicode equivalents for \w and \b in Java regular expressions?
.... That way, a regex like \w+ matches words like hello , élève , GOÄ_432 or gefräßig .
3 Answers
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Can I target all tags with a single selector?
...
¯_(ツ)_/¯ "can" != "should". Even so, the Sass/LESS options give you extensibility that vanilla CSS does not. Think of something like font-size: (48px / @index).
– Steve
Jul 21 '16 at...
MySQL: determine which database is selected?
After calling mysql_select_db to grab a database, is there any way to later output the name of the database that is currently selected? This seems very basic but I couldn't find anything on php.net or stackoverflow (all results are for "no database selected").
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check if jquery has been loaded, then load it if false
...it will add one dynamically from path specified.
Ref: Simulate an "include_once" for jQuery
OR
include_once equivalent for js. Ref: https://raw.github.com/kvz/phpjs/master/functions/language/include_once.js
function include_once (filename) {
// http://kevin.vanzonneveld.net
// + original b...
How to remove multiple indexes from a list at the same time? [duplicate]
...e is actually a contiguous sequence of indexes, so you can do this:
del my_list[2:6]
which removes the slice starting at 2 and ending just before 6.
It isn't clear from your question whether in general you need to remove an arbitrary collection of indexes, or if it will always be a contiguous se...
Best approach for designing F# libraries for use from both F# and C#
...ed automatically. For example:
type A(arg) =
member x.Invoke(f: Func<_,_>) = f.Invoke(arg)
let a = A(1)
a.Invoke(fun i -> i + 1)
So it makes sense to use Func/Action where applicable. Does this eliminate your concerns? I think your proposed solutions are overly-complicated. You can wr...
What's the Best Way to Shuffle an NSMutableArray?
... to answer by Ladd.
Edit: Changed (arc4random() % nElements) to arc4random_uniform(nElements) thanks to answer by Gregory Goltsov and comments by miho and blahdiblah
Edit: Loop improvement, thanks to comment by Ron
Edit: Added check that array is not empty, thanks to comment by Mahesh Agrawal
//...
Parsing domain from a URL
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Check out parse_url():
$url = 'http://google.com/dhasjkdas/sadsdds/sdda/sdads.html';
$parse = parse_url($url);
echo $parse['host']; // prints 'google.com'
parse_url doesn't handle really badly mangled urls very well, but is fine if you g...
How to empty a list?
...explanation of del, I'd refer to the docs: docs.python.org/reference/simple_stmts.html#the-del-statement
– fortran
Sep 9 '09 at 16:28
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