use the command line interface (cli) to answer the following questions: according to the command line help, which switch can you use with the killall command to kill a process only if it is running as a specific user? view the contents of the /root/.bash profile file. what is the last word in the file? what is the value for the shell environment variable? list the iptables firewall rules. which tcp services have been allowed through the firewall for the input chain?