Linux Foundation sys administrator revision site - too in depth or in depth enough ?

[fkkroundabout]

for anyone who has already done the system administrator exam and it is relatively fresh in your memory:

could you tell me if this website linked below is the right amount of detail, or too in depth and unnecessarily detailed ?

http://www.tecmint.com/sed-command-to-create-edit-and-manipulate-files-in-linux/

thank you

edit: oops just saw this comment: www.tecmint.com/sed-command-to-create-edit-and-manipulate-files-in-linux/comment-page-1/#comment-432083 (http://www.tecmint.com/sed-command-to-create-edit-and-manipulate-files-in-linux/comment-page-1/#comment-432083)

[Li_Wu]

it's a good article. just about right depth!