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I really don't understand bash's use of control characters. I understand simple things like adding colors with escape sequences but am at a loss for how to do things like bind keys in .inputrc.

For example, is there a way to type things like Shifta and see how I should represent it in .inputrc?

Much like the fellow does here: http://linuxart.com/log/archives/2005/10/13/super-useful-inputrc

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For reference, here's archive.org's copy of the (dead) link in OP's question. The codes shown therein are emacs lisp style codes. I don't know much about them. Of course, there's more than one way to skin a cat, but what follows is probably the easiest:

First, use showkey -a to get the hexadecimal representation for your keyboard sequence. For example, when I press CtrlShift~, I get:

^^       30 0036 0x1e

So, my hex representation is 0x1e. I can then add a line to my ~/.inputrc:

"\x1e": beginning-of-line

And the next time I open a bash shell (or any program that uses readline), typing CtrlShift~ will move my cursor to the beginning of the line. You can also do something like:

"\x1b\x5a": "type this text whenever I press alt+shift+z"
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