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Calling shell functions with xargs
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Exporting the function should do it (untested):
export -f echo_var
seq -f "n%04g" 1 100 | xargs -n 1 -P 10 -I {} bash -c 'echo_var "$@"' _ {}
You can use the builtin printf instead of the external seq:
printf "n%04g\n" {1..100} | xargs -n 1 -P 10 -I {} bash -c...
How can I create tests in Android Studio?
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This answer is for people who are just getting started with Android testing. I will provide two simple examples to help you see how testing works. If you follow along for the next 10 minutes, you will be all set up to start adding your tests to your own app. I think you'll be surprised how ea...
Invalid argument supplied for foreach()
... It's a shame he didn't go on to say it wasn't for sure the most efficientest, though :D
– Gui Prá
Feb 10 '15 at 1:38
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show 4 more comme...
How do I pass parameters into a PHP script through a webpage?
...ipt needs to run (which I normally pass through the command line when I am testing the script).
2 Answers
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Can someone explain the right way to use SBT?
... example, right now, I'm starting a brand new project. I want to use the latest features of SLICK and Scala and this will probably require the latest version of SBT. What is the sane point to get started, and why?
I think the sane point is to build immunity to sbt gradually.
Make sure you unders...
How can I get a precise time, for example in milliseconds in Objective-C?
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@nevyn you just saved my internet speed test, ty! Damn I'm glad I read the comments before copy pasting code heh
– Albert Renshaw
Oct 31 '17 at 0:01
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What's the simplest way to test whether a number is a power of 2 in C++?
...s, so must AND to 0 bitwise.
As I was assuming unsigned numbers, the == 0 test (that I originally forgot, sorry) is adequate. You may want a > 0 test if you're using signed integers.
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imp...
Is there a performance difference between i++ and ++i in C++?
...double(CLOCKS_PER_SEC)) << '\n';
return 0;
}
O(n) increment
Test
// b.cc
#include <array>
class Something {
public:
Something& operator++();
Something operator++(int);
private:
std::array<int,PACKET_SIZE> data;
};
Something& Something::operator++()
{...
How to forward declare a template class in namespace std?
...s reserved for use by the implementation, so you should use something like TEST_H instead of __TEST__. It's not going to generate a warning or an error, but if your program has a clash with an implementation-defined identifier, then it's not guaranteed to compile or run correctly: it's ill-formed. A...
Count how many records are in a CSV Python?
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2018-10-29 EDIT
Thank you for the comments.
I tested several kinds of code to get the number of lines in a csv file in terms of speed. The best method is below.
with open(filename) as f:
sum(1 for line in f)
Here is the code tested.
import timeit
import csv
import p...