undelete the deleted command in bash

问题:

If you have written a really long command, say cd /very/long/path, and then you do ctrl+c or ctrl+u (if the cursor is at the end), and then you realise that you want the command back, is there any way to get the full line back without re-typing. Is there any trick to change .bashrc so that bash_history keep track of keys pressed on the shell and not just after the enter is hit.

I have answered a question at In bash, how does one clear the current input? and realised if we have some option like this it would be very helpful.

回答1:

To undo, use either

• Ctrl+X, Ctrl+U; or
• Ctrl+_ (underscore).

See bind -P for a full list of keybindings in bash.