Doing this homework about Linux Commands. Need help with this questions 5 - Wort

Question

 Doing this homework about Linux Commands. Need help with this questions  5 - Worth 1 point.      a) Run command to listen to your computer's ports, as learned in class, 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 - Worth 1 point.      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

Explanation / Answer

#5)a) netstat -an

b) grep [^a-zA-Z0-9] file

#6)a) grep [a|b|c|d|e|f|g|h|i|j|k|l|m|n|o|p|q|r|s|t|u|v|w|x|y|z|A|B|C|D|E|F|G|H|I|J|K|LM|N|O|P|Q|R|S|T|U|V|W|X|Y|Z] file

b) grep 'd{3}-d{3}-d{4}' file

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