How many ways to start a process do you know?
Note: The titular question applies only to different ways in Perl.
I am planning to write a small guide/comparison of the different ways to start a process in Perl and while thinking about all the ways i do know, became certain that:
1. my knowledge about the ways i know is not complete
2. there will be ways i do not even know about
Thus i am turning to the Perl community for help. Please tell me what ways you know to start a process in Perl and all of the permutations it can go through. :)