thefuck

Run it after a failed command and it proposes the fixed version for you to confirm.

What it does

thefuck inspects the last command and its error output, matches it against a library of rules — missing sudo, a typo’d subcommand, git brnch, a forgotten -p on mkdir, the wrong package manager — and prints the corrected command. Enter runs it.

$ git brnch
git: 'brnch' is not a git command.
$ fuck
git branch [enter/↑/↓/ctrl+c]

Notes

Requires a shell alias: eval "$(thefuck --alias)", optionally renamed (thefuck --alias fix).
Written in Python, so it carries a Python dependency and adds noticeable startup latency to the alias.

Alternative to

Alternative	Type	Trade-off
pay-respects	Open source	A Rust rewrite, much faster to start
`sudo !!`	Built in	The built-in answer to the most common case
Shell aliases for your own typos	—	Zero latency, and it fixes them permanently