Need assistance with shell scripting and using the sed comma

Need assistance with shell scripting and using the sed command in Linux/UNIX

Consider the address book 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

Part 1: Provide the sed command to: Substitute the 3rd occurrence of “asu” in email address with “vcu”.

Part 2: Provide the sed command to: Remove all imap and imap number from the email addresses

Part 3: Provide the sed command to: Add the string “School Email” next to all email addresses ending with “.edu”

Part 4: Provide the sed command to: Move the email addresses to the end of the lines

Solution

1.

$ sed \'s/asu/vcu/3\' addr.txt

4.

$ sed -r \"s/^([^,]+)(,[^,]+)(.*)/\\1\\3\\2/g\" addr.txt