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How can I run a program ('prog') through perl (in unix) and feed her required parameters?

system ("prog \n"); ?????????

now 'prog' ask for parameters and I want the perl script to give them...

I need to find in a given file (text) all lines containing the word 'bla' AND all lines containing the word 'blue' and so on...
The following command is not good because it gives the lines...

Hi.
After using the command 'who' and getting all used accounts on current machine -
how can i found out who are the users?