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I've been unable to find documentation for two keyboard shortcuts in iterm2 or bash (not sure which is doing it), namely Optiontab and tabtab. When I use them, I get a question, for example, 

Display all 192 possibilities (y or n)?

for Optiontab, or 

Display all 3929 possibilities (y or n)?

for tabtab

When I say y, I get lists of things I may have typed recently, or things that look like files on my path. Because of the large numbers of things, it's difficult to tell exactly what's going on.

I looked at the iTerm2 documentation and I did a few searches for "option-tab" and various cheat sheets, but the answer wasn't forthcoming.

Reb.Cabin
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    It's the bash auto completion. If you start entering something on the command line and hit you'll see the results are fewer. Try `echo $`, you should get a list of variables. – Beggarman Jul 31 '14 at 13:07
  • What do you get as output if you type `Ctrl-v` `Option-tab` in your shell? – Etan Reisner Jul 31 '14 at 13:24
  • @EtanReisner I get `^[` (looks like `Ctrl` `left-bracket`, then, if I press `Enter`, `-bash: command not found`. Still no good idea of what's going on. – Reb.Cabin Jul 31 '14 at 13:46
  • Option-tab works the same as tab for me; for you it looks like it generates ASCII 033 (escape). This is likely an iterm2 configuration issue, unrelated to `bash`. – chepner Jul 31 '14 at 15:40
  • I don't know why `escape` `escape` (assuming that's what you meant given what `option-tab` generates) would generate a different list of possible completions than tab (it doesn't seem to here). – Etan Reisner Jul 31 '14 at 15:56
  • @EtanReisner yup, i double checked -- I get a much shorter list of things with `option`-`tab`, and they're not the names of files on my path, but rather look like command-line arguments that I've typed recently, things like `--upgrade` and `"my recent git commit message"` and `../foo/bar/baz/qux`. – Reb.Cabin Jul 31 '14 at 17:26
  • @chepner if I directly type `esc` `esc`, I don't get anything useful. My `option` `tab` shortcut must be doing something else than aliasing directly to `esc` `esc` – Reb.Cabin Jul 31 '14 at 17:27
  • Does `esc` `tab` `esc` `tab` get you what `option-tab` does? – Etan Reisner Jul 31 '14 at 20:57

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