- Technically, there's no difference between for and foreach other than some style issues.



One is an alias of another. You can do things like this



foreach (my $i = 0; $i < 3; ++$i)

{ # normally this is foreach print $i, "n";}



for my $i (0 .. 2)

{ # normally this is for print $i, "n";}



- exec runs the given process, switches to its name and never returns while system forks off the given process, waits for it to complete and then returns.

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