Bash and declare

[kburtch-Zd07PnzKK1IAvxtiuMwx3w at public.gmane.org]

In addition to assigning attributes, declare is used with the nounset option.
 By declaring variables, Bash is able to check for spelling mistakes in
variables.  Otherwise Bash assumes that a badly spelled variable name is
really a new variable, something Perl doesn't do.

Ken B.

Christopher Browne <cbbrowne-Re5JQEeQqe8AvxtiuMwx3w at public.gmane.org> said:

> On 3/29/06, Neil Watson <tlug-neil-8agRmHhQ+n2CxnSzwYWP7Q at public.gmane.org> wrote:
> > I bought Ken's book on Bash scripting.  In it he talks about using
> > 'declare' to initialize variables.  In Perl 'my' is used like declare
> > but, more specifically for variable scope.  What is the purpose of
> > declare?
> 
> It is used to indicate variable attributes.
> 
> declare -a arr
>   indicates that arr is an array
> 
> declare -i ival
>   indicates that ival stores integers, as opposed to strings/floats
> 
> declare -r rval
>   indicates that rval is now read-only
> 
> There are several other declaration options; see the man page :-).
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