How can I add a string to the end of each line in Vim?

Even shorter than the :search command:

:%norm A*

This is what it means:

 %       = for every line
 norm    = type the following commands
 A*      = append '*' to the end of current line

:%s/$/\*/g

should work and so should :%s/$/*/g.

I think using visual block mode is a better and more versatile method for dealing with this type of thing. Here's an example:

This is the First line.  
This is the second.  
The third.

To insert " Hello world." (space + clipboard) at the end of each of these lines:

On a character in the first line, press Ctrl-V (or Ctrl-Q if Ctrl-V is paste).
Press jj to extend the visual block over three lines.
Press $ to extend the visual block to the end of each line. Press A then space then type Hello world. + then Esc.

The result is:

This is the First line. Hello world.  
This is the second. Hello world.  
The third. Hello world.

(example from Vim.Wikia.com)

Also:

:g/$/norm A*

Also:

gg<Ctrl-v>G$A*<Esc>

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