Linux commands a) Run a command to listen to your computer's ports, such as: tcp 0 0 0.0.0.0:27017 0.0.0.0:* LISTEN 1315/mongod tcp6 0 0 :::139 :::* LISTEN 1079/smbd udp 0 0 0.0.0.0:5353 0.0.0.0:* 714/avahi-daemon: r udp6 0 0 :::48054 :::* 714/avahi-daemon: r b) Write the commands that will display lines with anything not a letter or number in a text file 6 - a) Write the commands that will display lines containing letters a thru z and A thru Z in a text file b) Write the commands that will display lines with numbers only using the following format xxx-xxx-xxxx found in a text file