Execute a terminal command from a Cocoa app

Question

How can I execute a terminal command (like grep) from my Objective-C Cocoa application?

Answer 1

Custos Mortem said:

I'm surprised no one really got into blocking/non-blocking call issues

For blocking/non-blocking call issues regarding NSTask read below:

asynctask.m -- sample code that shows how to implement asynchronous stdin, stdout & stderr streams for processing data with NSTask

Source code of asynctask.m is available at GitHub.