In Bash shell, when editting in the command line. There are two different modes, vi mode or Emacs mode. Emacs-mode is the default mode. Below are some of the handy shortcuts in Emacs-mode.

• ALT-b and ALT-f: go backward(toward begining of the line)/forward (toward end of the line) a word. Note that - is a word separator in this case.
• Ctrl-A and Ctrl-E: go to begining/end of the line.
• Ctrl-K and Ctrl-U: delete till the end/begining of the line.
• Ctrl-R: search history command. Press Enter to run a command, or press movement key to edit it.
• ALT-D: Delete from current cursor position to the end of the word.
• Ctrl-_: Undo edit.
• ALT-R: Revert command to original.
• Ctrl-W: Delete a word backward. Note that here word is separate by space. So if we have python util/test.py| (| indicate cursor) , pressing Ctrl-W leave us with only python . - is not a word separator in this case. A little inconsistent, IMHO.

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