How to create your own command or function in Vim that can execute a set of commands

Place the following text in your vim.rc file:

function Myfunc <function name starting with a Capital letter>

<tab>:%s/://g

<tab>:%s/something/another/g

endfunction

Now in your vim file you can do

:call Myfunc()

How to run the last n commands in Vim

Here is a summary to execute your command of choice from command history:

q: (opens the command history window)
use vim browsing keys to go to the command you want to execute. Alternately :n where n is line number of the command to execute, will place you on the line.
CR -> (Carriage return) Press enter to execute the command.

If you want to run the last n commands for example:

How to increase the history limit:

put this line in your vim.rc file: set history 100 (100 will be the history limit)

If this history limit is not taking effect, please read here: How to increase cmdline history size