On Tue, Sep 4, 2012 at 7:13 PM, Roman Rakus <rrakus@redhat.com> 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