This will probably be an easy question. I have a script that takes a comma delimited string of IP addresses as an argument and then proceeds to nmap port scan each IP address. The problem is, I don't want to loop through each string in a foreach loop, and then execute the system call after the prior call returns successful or not successful. What I'd like to do is basically take the string and if there are 5 IP addresses, kick off 5 parallel system executions, but I want to do it in a controlled fashion. I'm sure something like the following would work:
$strg = $ARGV[0]; @someary = split ',', $strg;
foreach (@someary) { $host = $_; $scancmd = qq!nmap -sS -P0 -p 1-65535 -T 5 -O -oG ./$host-scan.txt $host!; system ($scancmd) } exit 0;
And while that would work, I'm not so sure it will release each process and go to the next variable in the array, or if it will wait until the command completes, in fact I'm probably 100% sure it will wait for the system call to finish prior to moving forward, which really makes the script slow.
So, what I'm looking for is some sort of parallel execution module that I can reference to create multiple PID's and then manage each one to validate success or failure of the command.
Thoughts?
-Wes
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