"Type history at the Bash command prompt, and you'll get a list
of your previous commands. You can navigate through these with the
up and down arrows, but there are other ways of interacting with
them that I've been investigating this week. One straightforward
option is to use the number at the start of the line to refer to
the command. So,
"will execute the line numbered 15268. !! executes the last
command, and !-2 will execute the last-but-two command.
"You can edit previous commands quickly using :s///. For
example, if you typed 'temp' when you meant 'tmp' in command 15200,
use this to correct it:"
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