Press ctrl+r in a bash shell and type a few letters of a previous command

^r in bash begins a reverse-search-history with command completion
In the sample output, I pressed ctrl+r and typed the letters las. I can't imagine how much typing this has saved me.
Sample Output
(reverse-i-search)`las': last -a | head

By: abcde
2009-02-19 18:17:54

What Others Think

Keep pressing ^r to continue pattern matching backwards through your history.
atoponce · 633 weeks and 3 days ago
And ^s to go forward in history.
Ammar · 559 weeks ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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