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Instead of displaying all possibilities on terminal screen, as in:

$ ls /etc/<TAB>
Display all 230 possibilities? (y or n)

I want to save all possibilities to a file.

ls /etc/ > file.txt will not always work. apt-get is an example:

$ apt-get <TAB>
autoclean        check            install          update
autoremove       clean            purge            upgrade
build-dep        dist-upgrade     remove           
changelog        dselect-upgrade  source           

I'm looking for a command like tabcompletions 'ls /etc/' which outputs all possibilities, so that I can run a command like the one below, which compares the tab completion possibilities for two commands:

diff <(tabcompletions 'ls ') <(tabcompletions 'cd ')

Is that possible?

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Also see unix.stackexchange.com/questions/23900/… –  cwd Dec 31 '12 at 2:50
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2 Answers

Although, a crude method, you could use the command script

$ script -a lsdiff
Script started, file is lsdiff
$ ls <TAB>
a b c ...
$ <Ctrl-D>
Script done, file is lsdiff

Repeat the above for cd and compare the difference.

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In your ~/.bashrc you probably have something like this:

if [ -f /etc/bash_completion ] && ! shopt -oq posix
then
    source /etc/bash_completion
fi

Now, that's where to continue looking, and the header of _quote_readline_by_ref contains the necessary hint:

compgen -f /etc/

Tracing this back, it turns out that (via type compgen) compgen is a "shell builtin", which means it should appear in man bash:

compgen [option] [word]
       Generate possible completion matches for word according to the options ...
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An example using a completion function, as _apt_get would be interesting. –  enzotib Sep 27 '11 at 15:59
    
@enzotib compgen -F _apt_get, except that it's not so simple: you would need to set a bunch of variables to emulate the real completion system. Zsh is even worse, the completion primitives (compadd, compset) only work if called from a completion widget, which in turns only works from the line editor, not from a script or even from a command line. –  Gilles Sep 27 '11 at 22:23
    
@Gilles: thank you. –  enzotib Sep 28 '11 at 7:04
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