In bash what does ! (exclamation mark) before command means?

问题

I just mispelled command

git status

with

!git status

Console showed it started cloning last cloned repository into folder status...

My question is, what does this command mean and does it have any usage?

回答1:

In bash, if you type ! followed by a command name, it will substitute it with the last command in your history starting by that name.

So in your case !git was substituted with git clone somerepo so the whole line was translated to git clone somerepo status

来源：https://stackoverflow.com/questions/48748030/in-bash-what-does-exclamation-mark-before-command-means