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How to use double or single brackets, parentheses, curly braces
...ures weren't available before Bash 4.
Thanks to gboffi for reminding me about brace expansions.
Double parentheses are used for arithmetic operations:
((a++))
((meaning = 42))
for ((i=0; i<10; i++))
echo $((a + b + (14 * c)))
and they enable you to omit the dollar signs on integer and arr...
Multiple GitHub Accounts & SSH Config
...
One of best answers. Also this video helped me. youtube.com/watch?v=fnSRBRiQIU8&feature=youtu.be
– TestingWithArif
Mar 4 '18 at 11:58
...
Simple state machine example in C#?
...ocessState nextState;
if (!transitions.TryGetValue(transition, out nextState))
throw new Exception("Invalid transition: " + CurrentState + " -> " + command);
return nextState;
}
public ProcessState MoveNext(Command command)
{
...
Where to place $PATH variable assertions in zsh?
...etc/profile isn't listed in any zsh documentation I can find.
This turns out to be partially incorrect: /etc/profile may be sourced by zsh. However, this only occurs if zsh is "invoked as sh or ksh"; in these compatibility modes:
The usual zsh startup/shutdown scripts are not executed. Login s...
Can git automatically switch between spaces and tabs?
...bspace.clean 'gexpand --tabs=4 --initial'
All systems
You may now check out all the files of your project. You can do that with:
git checkout HEAD -- **
and all the python files will now have tabs instead of spaces.
Edit: changed the forced checkout command. You should commit your work first,...
What is Dependency Injection and Inversion of Control in Spring Framework?
...pring, objects define their associations (dependencies) and do not worry about how they will get those dependencies. It is the responsibility of Spring to provide the required dependencies for creating objects.
For example: Suppose we have an object Employee and it has a dependency on object Addre...
Why is there a difference in checking null against a value in VB.NET and C#?
... languages, built by different teams who have made different assumptions about usage; in this case the semantics of a NULL comparison.
My personal preference is for the VB.NET semantics, which in essence gives NULL the semantics "I don't know yet". Then the comparison of 5 to "I don't know yet". is...
Why .NET String is immutable? [duplicate]
...other versions of the same principle. I once produced a memory saving of about half a GB by comparing immutable objects and replacing references to duplicates so that they all pointed to the same instance (time-consuming, but a minute's extra start-up to save a massive amount of memory was a perform...
Output array to CSV in Ruby
...lues
end
end
Hmm @tamouse, that gist is somewhat confusing to me without reading the csv source, but generically, assuming each hash in your array has the same number of k/v pairs & that the keys are always the same, in the same order (i.e. if your data is structured), this should do the d...
Why do people write the #!/usr/bin/env python shebang on the first line of a Python script?
It seems to me like the files run the same without that line.
21 Answers
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