(1)I am learning how to use command in bash.
I excute a command by mistake,and use “mv” wrongly to make some system file into the /tmp dictionary
I search on google but make no sense. Is there any shortcut key like Ctrl+z can withdraw the latest command?

(2)When I want to move them back,it seems “I do not exist in the passwd datebase”,I could not understand what’s wrong

(English is not my mother tongue,if there is any word that I used by mistake please inform me.I will try my best to state clearly) enter image description here