Как повесить на клавишу команду в консоли?

можно сделать это на уровне шелла, man bash, bind -x

Спасибо, вариант подошёл. Единственное, что хочется заметить - это потенциальная проблема, на которую можно натолкнуться: баг в bash, связанный с назначением клавиш. Решение проблемы описано здесь:
http://groups.google.com/group/comp.unix.shell/browse_thread/thread/3e3b837a1...

Приведу основную идею:
>> bash key mapping handling is mostly bogus. You may have more
>> chance with:

>> bind -x $'"\201":clear'
>> bind '"\eOP":'$'"\201"'

>> Troubles begin as soon as there's one binding for a char
>> sequence, that gets even worse with "-x".

> Thanks, that worked.

> Now I need to re-read 'man bash' very carefully
> to try to understand why.

That's just a two step mapping.

First "clear" is mapped to the single character \201 (a
non-valid character in iso-8859-***, so there are few chances
that you may type it on keyboard) in the -x keymap, then <F1> is
mapped to that character.

The bug it works around is not described in the man page. There
are many others