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How can I check if a command exists in a shell script? [duplicate]
... script I would like to check if a certain command exists, and if not, install the executable. How would I check if this command exists?
...
ReactJS state vs prop
...ls so much as it cares about values and how they flow through your app. Ideally, your post model would be stored in a single component at the root. You then create child components that each consume parts of the model.
You can pass callbacks down to the children that need to modify your data, and c...
Add a new element to an array without specifying the index in Bash
...[@]}]}
h
Here's how to get the last index:
$ end=(${!array[@]}) # put all the indices in an array
$ end=${end[@]: -1} # get the last one
$ echo $end
42
That illustrates how to get the last element of an array. You'll often see this:
$ echo ${array[${#array[@]} - 1]}
g
As you can see, be...
Can you pass parameters to an AngularJS controller on creation?
...d;
$scope.name = name;
//Based on passed argument you can make a call to resource
//and initialize more objects
//$resource.getMeBond(007)
};
});
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What are the calling conventions for UNIX & Linux system calls (and user-space functions) on i386 an
Following links explain x86-32 system call conventions for both UNIX (BSD flavor) & Linux:
4 Answers
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Is main() really start of a C++ program?
...
No, C++ does a lot of things to "set the environment" prior to the call of main; however, main is the official start of the "user specified" part of the C++ program.
Some of the environment setup is not controllable (like the initial code to set up std::cout; however, some of the environment...
What does 'super' do in Python?
...
What's the difference?
SomeBaseClass.__init__(self)
means to call SomeBaseClass's __init__. while
super(Child, self).__init__()
means to call a bound __init__ from the parent class that follows Child in the instance's Method Resolution Order (MRO).
If the instance is a subclass of ...
.prop() vs .attr()
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Update 1 November 2012
My original answer applies specifically to jQuery 1.6. My advice remains the same but jQuery 1.6.1 changed things slightly: in the face of the predicted pile of broken websites, the jQuery team reverted attr() to something close to (but not exactly the same as...
Why would you use an ivar?
I usually see this question asked the other way, such as Must every ivar be a property? (and I like bbum's answer to this Q).
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API pagination best practices
...principles can be followed):
{
"data" : [
{ data item 1 with all relevant fields },
{ data item 2 },
...
{ data item 100 }
],
"paging": {
"previous": "http://api.example.com/foo?since=TIMESTAMP1"
"next": "http://api.example.com...