Re-run command with prepended text from bash history

Question

How do I repeat the last bash command with some text pre-pended to the front of it.

So if the previous command was:

$ ls /somedir

I want to run the following command utilizing the bash history to prevent retyping / copy & pasting:

$ sudo /somedir

Bonus, how about appending?

Answer 1

For sudo you can re-run the same command as above by using the double bang syntax.

ls /somedir
sudo !!

will run sudo ls /somedir

If you just want to use the same path then use !$

ls /somedir
ls -l !$

will run ls -l /somedir

Finally you can re-run commands from history by using ctrl+r to run a reverse-i-search of your bash history.