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I am using the vi since a few years. A few months ago i realized that i am just using a bit of the mighty power of the vi. Thats why O`Reilly's Learning the vi editor was welcomed in my house :-). I have just finised a small part of the book but found already some "new" stuff for me. Thats why this entry is a supplement to my vi knowledge. But maybe there is something for you out there too.

• :e! - returns you the last saved version of your file
• W - move forward from word by word without considering symbols and punctuation
• c2b - change two words backwards
• c$ - change to the end of the line
• cc - change the entire current line
• C - change characters from current cursor position to the end of the line
• s - substitute from current position
• S - same as cc
• R - puts you in "overwrite" mode
• ~ - change case of your letter (Upper- to Lowercase and other way)
• D - deletes from courrent position to the end of the line
• x - deletes current character
• X - deletes character before current position
• xp - delete current character ad put after curser
• y$ - yankes to the end of the line
• . - repeats last command
• O - opens blank line above curser
• J - joins two (or more) lines
• e - moves to the end of a word

Wow, after this list it is hard to believe that i am using the vi for years now, "we are absolute beginners" comes to my ears ;-).