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vim

Vi IMproved, a programmer's text editor, providing several modes for different kinds of text manipulation. Pressing i enters edit mode; the normal mode (accessed via <Esc>) doesn't allow regular text editing.

Open a file:

vim {{file}}

Enter text editing mode (insert mode):

<Esc> i

Copy ("yank") or cut ("delete") the current line (paste it with P):

<Esc> {{yy|dd}}

Undo the last operation:

<Esc> u

Search for a pattern in the file (press n to go to the next result):

<Esc> /{{search_pattern}} <Enter>

Perform a regex substitution in the whole file (from the start, 1, to the end, $):

<Esc> :1,$s/{{pattern}}/{{replacement}}/g <Enter>

Save (write) the file, and quit vim:

<Esc> :wq <Enter>