VI Editor

Delete All lines using vi editor:- 

1) open the file > vi filename.ext

2) Delete all the lines >

1. Esc gg  > select all the lines
2. Esc dG > delete all the lines
3. If you want to paste already in clipboard - Esc i + right click 

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COMMENDS:

: > says commend starts
1 > Starting line
$ > end line
d > delete