Require some UNIX/Linux please concerning shell scripting and using the sed comm

Question

Require some UNIX/Linux please concerning shell scripting and using the sed command

Consider the file addr below:

$ cat addr

Xiao Li, lxiao@unc.edu, 6705462234, Jackson, NC 764
Elizi Moe, emoe@ncsu.edu, 5208534566, Tempe, AZ 85282
Ma Ta, mta@yahoo.com, 4345667345, Austin, TX 91030
Diana Cheng, dcheng@asu.edu, 5203456789, Matitsi, WY 4587
Jackson Five, jfive@ncsu.edu, 5206564573, Kyenta, AZ 85483
Adi Srikanth Reddy, sadi1@imap1.asu.edu, 6578904566, Wyo, WS 67854 Natkin William, wnatkin@imap28.asu.edu, 8044344528, Richmond, VA 22345

Provide the sed command to:
Get rid of the lines with private (non “.edu”) email addresses.

Explanation / Answer

sed -i '/.edu/d' addr

The '.' is escaped using a '' to treat it as a character instead of a regular expression

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