On Tue, Sep 4, 2012 at 7:13 PM, Roman Rakus <[email protected]> wrote:
> Hi,
> Petr, adding to cc: list, found behaviour not documented, neither in man
> page nor bash ref manual:
> ${par-word} will do expansion of par, and if the par is unset it is
> substituted by word. It is different from ${par:-word}, where word is used
> when par is unset or null.
>
> Is it undocumented and deprecated, like $[]? Or just undocumented?
>
>From man page:
When not performing substring expansion, using the forms
documented
below, bash tests for a parameter that is unset or null. Omitting
the
colon results in a test only for a parameter that is unset.
>
> RR
>
>
