fuck() {
    sudo $(fc -ln -1)
} 

This function takes the last command and puts sudo in front of it. Actually used it in a zoom call at work without thinking and it took a second to realize why everyone was laughing. Not my invention–came across it years ago on stackoverflow or someplace and thought it was funny/useful.

kmirl@tux:~$ ls /root
ls: cannot open directory '/root': Permission denied
kmirl@tux:~$ fuck
[sudo] password for kmirl: 
bin  debs  docs  Mail 

Lazy vim way I do it:

ggVG"wY:q! followed by sudo !! then VG"wp:x

Grab entire file and stuff it in register W

Exit file

Reopen sudo

Select all and replace with register W them write