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`;
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