difference between `` system and exec

From: buildmorelines (bulk88_at_hotmail.com)
Date: 09/29/04 

Date: 28 Sep 2004 17:12:04 -0700

What is the difference between backtick `` command execution thing and
the system function and the exec function?

Which is fastest/most efficient, if I dont care about getting the
output of the command or sucess of command or control back to my Perl
program (falls off anyways)?

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