Due care must be spent on sanitizing and escaping the arguments if they are not hard coded. 

$file_name = 'file name';
system("program $file_name &");  # Oops!

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Without due care, the code may not work, or worse, it could be vulnerable to injection attacks.

In reply to Re^3: Asynchronous Program Spawning by ikegami
in thread Asynchronous Program Spawning by awohld

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