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Re: Query regarding ${parameter:-word} usage


From: DennisW
Subject: Re: Query regarding ${parameter:-word} usage
Date: Wed, 23 Dec 2009 18:14:46 -0800 (PST)
User-agent: G2/1.0

On Dec 23, 6:51 pm, Mun <address@hidden> wrote:
> Hi,
>
> I am moving from ksh93 to bash and have a question regarding the usage
> of ${parameter:-word} parameter expansion.
>
> In ksh, I use ${*:-.} as an argument to commands.  For example:
>
>    function ll
>    {
>       ls --color -Flv ${*:-.}
>    }
>
> This technique passes '.' as an arg to 'ls' if I didn't pass any args on
> the command line (as I'm sure you all already know).  But this does not
> work with bash; nor have I been able to come up with a technique that
> accomplishes the same thing.  My only workaround so far is to put an
> 'if' loop around the 'ls' that tests $# and takes the appropriate branch
> depending on the number of args (i.e., 0 or non-zero).
>
> Any suggestions would be welcomed.  Thanks in advance.
>
> --
> Mun

"This does not work with Bash" - In what way? It works fine for me.


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