Let me be perfectly clear: ed is the standard Unix text editor. If you don't know ed, you're not a real sysadmin.
Forty years after ed's introduction, internationally acclaimed author Michael W Lucas has finally unlocked the mysteries of ed for everyone. With Ed Mastery, you too can become a proper sysadmin.
Ed Mastery will help you:

• understand buffers and addresses
• insert, remove, and mangle text
• master file management and shell escapes
• comprehend regular expressions, searches, and substitutions
• create high-performance scripts for transforming files

You must be at least this competent to use this computer. Read Ed Mastery today

Every so often, men contact the author complaining that his books use both male and female pronouns. This special edition, using only male third person pronouns, is for those special people. As the market is so much smaller, it's unfortunately priced higher.

For each copy of the Manly McManface edition sold, the author will donate one dollar to his local chapter of Soroptomists International.