running parallel commands in lunix using C


i have a project where i should run in parallel different commands, for that i should use fork() and excevp() , in other words, when i will enter for exemple:
cmd a [ b c ] d [e f g],
i need to have 5 arrays:
a b d e null
a b d f null
a b d g null
a c d e null
a c d f null
a c d g null
i know that i need to have arrays of pointers, but i don t knowhow to deal with that!!! please help,

it's urgent,


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