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Dynamic variable names in Bash
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Use an associative array, with command names as keys.
# Requires bash 4, though
declare -A magic_variable=()
function grep_search() {
magic_variable[$1]=$( ls | tail -1 )
echo ${magic_variable[$1]}
}
If you can't use associative arrays (e.g...
How to use the pass statement?
...eached the section about the pass statement. The guide I'm using defines it as being a Null statement that is commonly used as a placeholder.
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How do I remove all .pyc files from a project?
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edited Jul 17 '18 at 9:27
Mark Amery
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How do I get the real .height() of a overflow: hidden or overflow: scroll div?
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edited Nov 30 '16 at 13:41
Mosh Feu
21.9k1212 gold badges6868 silver badges105105 bronze badges
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getenv() vs. $_ENV in PHP
...ly the same, except that getenv will look for the variable in a case-insensitive manner. Most of the time it probably doesn't matter, but one of the comments on the documentation explains:
For example on Windows $_SERVER['Path'] is like you see, with the first letter capitalized, not 'PATH' as...
error C2780: \'void __cdecl std::sort(_RI,_RI,_Pr)\' : expects 3 argum...
error C2780: 'void __cdecl std::sort(_RI,_RI,_Pr)' : expects 3 arguments - 2 providedprog7.cpp(8) :error C2780:'void __cdecl std::sort(_RI,_RI,_Pr)' : expects 3 arguments - 2 provided C: Pr...prog7.cpp(8) : error C2780: 'void __cdecl std::sort(_RI,_RI,_Pr)' : expects 3 arguments - 2 provided
C:...
How can I output leading zeros in Ruby?
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If the maximum number of digits in the counter is known (e.g., n = 3 for counters 1..876), you can do
str = "file_" + i.to_s.rjust(n, "0")
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How do I perform the SQL Join equivalent in MongoDB?
... use cases for $lookup, but at least as of 3.2 doing join is now possible with MongoDB.
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使用std::string作为std::map的key出错解决 - C/C++ - 清泛网 - 专注C/C++及内核技术
...0\vc\include\xstddef(180): error C2784: “bool std::operator <(const std::_Tree<_Traits> &,const std::_Tree<_Traits> &)”: 未能从“const std::string”为“const std::_Tree<_Traits> &”推导 模板 参数
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xtree(2245...
How to Execute SQL Server Stored Procedure in SQL Developer?
...dure. I added the JTDS SQL Server JDBC jar file to SQL Developer and added it as a Third Party JDBC driver. I can successfully log in to the SQL Server database. I was given this syntax for running the procedure:
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