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eval command in Bash and its typical uses
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eval takes a string as its argument, and evaluates it as if you'd typed that string on a command line. (If you pass several arguments, they are first joined with spaces between them.)
${$n} is a syntax error in bash. Inside the braces, y...
Get Substring - everything before certain char
...g to figure out the best way to get everything before the - character in a string. Some example strings are below. The length of the string before - varies and can be any length
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Comparing two strings, ignoring case in C# [duplicate]
...MHO the more efficient one, since the second 'solution' instantiates a new string instance.
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Get current directory name (without full path) in a Bash script
...cause dirname has functionality that ${PWD##*/} does not -- transforming a string with no slashes to ., for instance. Thus, while using dirname as an external tool has performance overhead, it also has functionality that helps to compensate for same.
– Charles Duffy
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Best way to add “current” class to nav in Rails 3
...nst the current page uri and returns either your current class or an empty string.
I've not tested this thoroughly and I'm very new to RoR (moving over after a decade with PHP) so if this has a major flaw I'd love to hear it.
At least this way you only need 1 helper function and a simple call in e...
What is the type of lambda when deduced with “auto” in C++11?
... pretty(T && t) { return __PRETTY_FUNCTION__; }, and strip off the extra if it starts to get crowded. I prefer to see the steps shown in template substitution. If you're missing __PRETTY_FUNCTION__, there are alternatives for MSVC, etc., but the results are always compiler-dependent for the ...
How do I do an OR filter in a Django query?
...item.moderated = False)
(edit - I was initially unsure if this caused an extra query but @spookylukey pointed out that lazy queryset evaluation takes care of that)
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Check if an element is present in an array [duplicate]
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!==-1 [extra chars]
– Francisc
Aug 7 '13 at 12:22
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onKeyPress Vs. onKeyUp and onKeyDown
... an empty input element:
The value of the input element will be an empty string (old value) inside the keypress handler
The value of the input element will be 1 (new value) inside the keyup handler.
This is of critical importance if you are doing something that relies on knowing the new value af...
XAMPP, Apache - Error: Apache shutdown unexpectedly
...and solved it by making sure that each directory specified in /apache/conf/extras/httpd-bhosts.conf were actual paths.
– Matthew
Mar 20 '15 at 23:43
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