Perl array exec() and system() function - Quick Tutorial

How to use the exec() and system() function

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 exec(PROGRAM);
 $result = system(PROGRAM); 
Both Perl's exec() function and system() function execute a system shell command. The big difference is that system() creates a fork process and waits to see if the command succeeds or fails - returning a value. exec() does not return anything, it simply executes the command. Neither of these commands should be used to capture the output of a system call.
If your goal is to capture output, you should use the backtick operator:
 $result = `PROGRAM`;