open last command in the editor with fc
Some time you have a long command and you want to edit multiple word in it. for example: $ cat foo.txt | grep foo | grep -v bar > foo_output.txt
Say you want to execute this 5 times and each replacing foo and bar with something else.
for that you can use the fc command.
$ fc
It will open a text editor (vim for me. I'm guessing it will look at $EDITOR env variable). After that you can edit or duplicate the line easily. Each line will be treated as a single command.
You can as well do something like
$ fc foo=baz
It will replace all instance of foo in the command and replace it with baz
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