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
bar with something else.
for that you can use the
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