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Re: param expansion with single-character special vars in the environmen


From: Grisha Levit
Subject: Re: param expansion with single-character special vars in the environment
Date: Sat, 14 May 2016 12:41:05 -0400

On Mon, May 2, 2016 at 2:30 PM, Chet Ramey <address@hidden> wrote:

I ended up writing a new function: valid_nameref_value(name, flags) which
I can customize to serve this purpose.

Looks like this ends up getting bypassed in some cases when the value is an empty string:

declare -n r; : ${r=}
declare -n r; r=""
declare -n r; printf -v r ''
r=""; declare -n r

Each of these result in:

$ declare -p r
declare -n r=""

Which itself is invalid:

$ declare -n r=""
bash: declare: `': not a valid identifier

This new nameref takes assignments but doesn’t seem to do anything with them. It does cause at least one segfault though:

$ declare -n r; r=""
$ export r    # or readonly r
Segmentation fault: 11

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