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Test if a command outputs an empty string
...r larger outputs the difference may be significant:
$ time [ -z "$(seq 1 10000000)" ]
real 0m2.703s
user 0m2.485s
sys 0m0.347s
Compare it with:
$ time [ $(seq 1 10000000 | wc -c) -eq 0 ]
real 0m0.128s
user 0m0.081s
sys 0m0.105s
And even better:
$ time [ $(seq 1 10000000 | head -...
How to detect if a property exists on an ExpandoObject?
... The debugger being attached and Console.WriteLine are the slow bits. 10,000 iterations here takes less than 200ms (with 2 exceptions per iteration). The same test with no exceptions takes a handful of milliseconds. That means if you expect your usage of this code to only rarely be missing a pr...
One class per file rule in .NET? [closed]
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+1,000. Understanding the rationale for best practices and thinking twice before violating them is great. Slavish adherence is evil.
– dsimcha
Mar 12 '10 at 19:06
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How to set initial size of std::vector?
... I don't use list. How to set initial size of vector (for example to be 20 000 places, so to avoid copy when I insert new)?
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Access Denied for User 'root'@'localhost' (using password: YES) - No Privileges?
...d is 1
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Preferred method to store PHP arrays (json_encode vs serialize)
...ys of players), 2 => array(4 arrays of players)))), I did test with 750,000 iterations and serialize() is about 6% to 10% faster in that case. My function takes the average times for all iterations and compares them. I might post it here as one of answers
– MiChAeLoKGB
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How to convert a column number (e.g. 127) into an Excel column (e.g. AA)
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Example: =SUBSTITUTE(TEXT(ADDRESS(1,1000,4),""),"1","")
– Dolph
Oct 13 '10 at 18:55
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Using jQuery To Get Size of Viewport
...le="z-index:9999;position:fixed;bottom:0px;left:0px;color:#fff;background:#000;padding:10px">Height: ' + height + '<br>Width: ' + width + '</div>');
jQuery(window)
.resize(function() {
height = window.innerHeight;
width = window.inne...
mysql check collation of a table
...s utf8_general_ci vs utf8_unicode_ci. This can cause error messages like HY000, 1267, Illegal mix of collations (utf8_general_ci,IMPLICIT) and (utf8_unicode_ci,IMPLICIT) for operation '='... which is the message that brought me to this page.
– Dewi Morgan
Sep 2...
grant remote access of MySQL database from any IP address
... and run into error like below, this article is for you.
ERROR 1130 (HY000): Host ‘1.2.3.4’ is not allowed to connect to this
MySQL server
Change mysql config
Start with editing mysql config file
vim /etc/mysql/my.cnf
Comment out following lines.
#bind-address = 127.0.0.1
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