Convenience Functions
Starting new processes can be a powerful tool in your programming arsenal. Unix comes with a lot of little command-line utilities that perform useful functions. Sometimes it makes more sense to take advantage of these utilities rather than reimplementing their behavior. For example, you may have a Perl script that strips tags from HTML. If your application has a need for that kind of tag-stripping feature, it can be easier to start the Perl script and feed it your HTML rather than playing around with regular expression code in Objective-C.
The easiest way to start another program is to use the system() function. This will start a program, wait until it finishes, and then return the result code. system() actually passes ...
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