Want Vi / Vim on your Bash command line

set -o vi 
into your ~/.bash_profile (on Mac) or ~/.bashrc (on Linux). 
Now, if you press Esc when you're on the command line, you can go backward/forward word-wise pressingB resp. W or bring-up Vim's VISUAL mode pressing V.
After pressing Esc you can press to get back to the INSERT mode to modify your command.

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