Just like magic, you're now in vi-mode and can easily line-edit using vi-style key bindings in order to copy text, remove text, and jump around to different positions in the line of text. In order to enable it, you run the command $ set -o vi. The bash shell (again, via GNU Readline) is able to provide this functionality for us. While Emacs key bindings are all well and good if you're familiar with the Emacs text editor or otherwise find them convenient to use, there are those who are more comfortable using "vi-style" keyboard bindings because of their time spent in the vi text editor (normally via vim or nvim these days). Using complex keyboard combinations and committing them to memory may seem silly, but they can be extremely powerful when working with longer commands or recalling a command from your shell history yet wanting to edit a couple things before executing the command again. There are many more available for all kinds of things, such as copying text, pasting text, removing text, and using shortcuts to edit text. This was done using only one of the many Emacs keyboard combinations that is offered to the user of the shell. While exploring the shell, the first thing you do is type commands into it and most often get output, like so:
PROGRAM FOR EDITING SHELL MAC WINDOWS
Something to note, though, is that bash is also a reasonably popular option on other UNIX-style operating systems, so it's likely not far from your reach (and for you Windows users out there, there's always cygwin). As such, that is the shell I'll be talking about today. However, in the Linux world, the de facto standard has become bash and it is the default shell installed on all major Linux distributions at of the time of this writing. In the large ecosystem of computing and operating systems, there are many shells. I'll introduce one for you here by showing the shell's vi-mode. Many developers and systems operators share their "dot files" (a common slang term for their shell's configuration files) publicly out on the Internet, which leads to an interesting collaboration opportunity that allows everyone to learn tips and tricks from seasoned veterans of the command line as well as share common shortcuts and productivity boosters. One of my favorites is the "command line," or shell, because learning about how people use the shell proficiently can give you an insight into how they think, what kind of workflows they favor, and to some extent what makes them tick.
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