You can send all of the output from the command (STDOUT AND STDERR) to /dev/null - commandName 2>&1 >/dev/null
You can use the command arp to control and view the arp table.
In order to eject the cdrom drive, you can use the command eject.
You can identify the path where the PID was executed by running pwdx 44556 and you will get the command executing path as an output.
You can use the script application for this functionality - type script - a mysession.log and it will start recording your terminal to mysession.log, when you want to exit, type exit.