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Re: nullglob option breaks complex parameter expansion/deletion


From: Paul Jarc
Subject: Re: nullglob option breaks complex parameter expansion/deletion
Date: Tue, 05 Jul 2005 17:49:21 -0400
User-agent: Gnus/5.110003 (No Gnus v0.3) Emacs/21.4 (gnu/linux)

address@hidden wrote:
>         I had been using ${HOSTNAME%%.*} in my prompt to show the local
>         host name portion of my full host name (e.g. localhost instead
>         of localhost.localdomain).  After enabling the nullglob shell
>         option, this pattern is being replaced by a null string.

How exactly are you setting your prompt?

>         $ connectioninfo='${HOST%%.*} ${USER}'
>         $ echo $connectioninfo

This doesn't demonstrate any misbehavior in parameter expansion,
because ${HOST%%.*} does not undergo parameter expansion at all - in
the first line, because it is quoted, and in the second line, because
it is the result of parameter expansion.  Try this instead:
$ echo ${HOST%%.*} ${USER}

This way, the HOST and USER parameters are expanded.  On my system, it
gives the same output regardless of whether $HOST contains a dot or
whether any existing files match.


paul




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