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Appending a line to a file only if it does not already exist
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Just keep it simple :)
grep + echo should suffice:
grep -qxF 'include "/configs/projectname.conf"' foo.bar || echo 'include "/configs/projectname.conf"' >> foo.bar
-q be quiet
-x match the whole line
-F pattern is a plain string
https://linux.die.net/man/1/grep
Edit:
incorpor...
What is the most efficient way to create HTML elements using jQuery?
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What's “requestCode” used for on PendingIntent?
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Including Google Web Fonts link or import?
What is the preferred way of including Google Web Fonts to a page?
3 Answers
3
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How can I make a WPF combo box have the width of its widest element in XAML?
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What is the best (and safest) way to merge a Git branch into master?
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Programmatically find the number of cores on a machine
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C++11
#include <thread>
//may return 0 when not able to detect
const auto processor_count = std::thread::hardware_concurrency();
Reference: std::thread::hardware_concurrency
In C++ prior to C++11, there's no portable way...
What is the recommended way to delete a large number of items from DynamoDB?
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Does a method's signature in Java include its return type?
Does the method signature in a Java class/interface include its return type?
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Example of UUID generation using Boost in C++
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A basic example:
#include <boost/uuid/uuid.hpp> // uuid class
#include <boost/uuid/uuid_generators.hpp> // generators
#include <boost/uuid/uuid_io.hpp> // streaming operators etc.
int main() {
boost::u...