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Quick-and-dirty way to ensure only one instance of a shell script is running at a time
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#!/bin/bash
(
# Wait for lock on /var/lock/.myscript.exclusivelock (fd 200) for 10 seconds
flock -x -w 10 200 || exit 1
# Do stuff
) 200>/var/lock/.myscript.exclusivelock
This ensures that code between ( and ) is run only by one process at a time and that the process doesn’t wait to...
How do you loop in a Windows batch file?
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If you want to do something x times, you can do this:
Example (x = 200):
FOR /L %%A IN (1,1,200) DO (
ECHO %%A
)
1,1,200 means:
Start = 1
Increment per step = 1
End = 200
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How does facebook, gmail send the real time notification?
... heard, they developed HipHop for the express purpose of converting PHP to C++, as PHP wasn't performing well enough.
– cHao
Oct 16 '11 at 7:14
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Is it possible to program iPhone in C++
...ctive C is insane. So I'm curious: is it possible to code iPhone apps with C++ while using the Cocoa API, etc?
11 Answers
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Why do we need extern “C”{ #include } in C++?
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C and C++ are superficially similar, but each compiles into a very different set of code. When you include a header file with a C++ compiler, the compiler is expecting C++ code. If, however, it is a C header, then the compiler expe...
How to create an HTTPS server in Node.js?
... cert: certificate});
var handler = function (req, res) {
res.writeHead(200, {'Content-Type': 'text/plain'});
res.end('Hello World\n');
};
var server = http.createServer();
server.setSecure(credentials);
server.addListener("request", handler);
server.listen(8000);
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How different is Objective-C from C++? [closed]
What are the main differences between Objective-C and C++ in terms of the syntax, features, paradigms, frameworks and libraries?
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How much faster is C++ than C#?
...ytecode based language like C# or Java that has a JIT cannot be as fast as C++ code. However C++ code used to be significantly faster for a long time, and also today still is in many cases. This is mainly due to the more advanced JIT optimizations being complicated to implement, and the really cool ...
What is Cache-Control: private?
...client has the most recent version already. Rather than sending the client 200 OK, followed by the contents of the page, instead it tells you that your cached version is good:
304 Not Modified
Your browser did have to suffer the delay of sending a request to the server, and wait for a response, b...
What is the difference between g++ and gcc?
...ference between g++ and gcc? Which one of them should be used for general c++ development?
10 Answers
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