How to see a running process in Unix

All your processes can be found under /proc and you can also get the number of open files from there. Or use lsof

For Unix :

# ps -aef | grep {process-name} ; pfiles {PID}

For Linux : 

#ps -C {program-name} -o pid= ; ls -l /proc/{PID}/fd

Or simplyuse

#lsof -p