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What is a fork? Why would one create a fork? What are the advantages and disadvantages of using a fork?

Please advise.

Thank You.

Deepali

In my /etc/profile, my $PATH variable is set as follows:

$PATH =/sbin:/usr/sbin:/usr/bin:/etc

Then how do I add an additional directory to it? say
/export/home/abd/rose

Please advise.
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