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What are the uses of the exec command in shell scripts? [closed]
...ernel, there are a family of them based on execve, which is usually called from C.
exec replaces the current program in the current process, without forking a new process. It is not something you would use in every script you write, but it comes in handy on occasion. Here are some scenarios I hav...
How to get an array of unique values from an array containing duplicates in JavaScript? [duplicate]
...
Edited
ES6 solution:
[...new Set(a)];
Alternative:
Array.from(new Set(a));
Old response. O(n^2) (do not use it with large arrays!)
var arrayUnique = function(a) {
return a.reduce(function(p, c) {
if (p.indexOf(c) < 0) p.push(c);
return p;
}, []);
};
...
How to get a Fragment to remove itself, i.e. its equivalent of finish()?
... so multiple activities can all respond to the "we got the OK click" event from Df.
– CommonsWare
May 5 '11 at 17:18
1
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Understanding colors on Android (six characters)
...green and blue respectively).
So by removing the final 55 you're changing from A=B4, R=55, G=55, B=55 (a mostly transparent grey), to R=B4, G=55, B=55 (a fully-non-transparent dusky pinky).
See the "Color" documentation for the supported formats.
...
How to redirect to Index from another controller?
...een looking through trying to find some way to redirect to an Index view from another controller.
6 Answers
...
How to write logs in text file when using java.util.logging.Logger
...rs(false);
since the ConsoleHandler is registered with the parent logger from which all the loggers derive.
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What is the purpose of setting a key in data.table?
...ns of the form x[i] required key to be set on x. With the new on= argument from v1.9.6+, this is not true anymore, and setting keys is therefore not an absolute requirement here as well.
## joins using < v1.9.6
setkey(X, a) # absolutely required
setkey(Y, a) # not absolutely required as long a...
Find objects between two dates MongoDB
...o pass a Javascript Date object.
Yes, it has to be ISODate friendly
Yes, from my experience getting this to work, you need to manipulate the date to ISO
Yes, working with dates is generally always a tedious process, and mongo is no exception
Here is a working snippet of code, where we do a littl...
How to reference a file for variables using Bash?
.../usr/bin/env bash
source config.sh
echo $production
Note that the output from sh ./script.sh in this example is:
~$ sh ./script.sh
playschool_joe
liveschool_joe
This is because the source command actually runs the program. Everything in config.sh is executed.
Another way
You could use th...
How to create the perfect OOP application [closed]
...ing a class hierarchy. There is an abstract base class Item. Book inherits from it. There is an abstract class SalesTax; BasicSalesTax inherits from it. And so on.
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