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Re: [Help-bash] Errorneously flagged undefined variable with here string
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From: |
Chet Ramey |
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Subject: |
Re: [Help-bash] Errorneously flagged undefined variable with here string redirected to bash-allocated file descriptor when followed by a command? |
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Date: |
Mon, 10 Dec 2018 10:00:09 -0500 |
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User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:60.0) Gecko/20100101 Thunderbird/60.3.3 |
On 12/9/18 6:06 AM, address@hidden wrote:
> Hello,
>
> I've encountered an error where bash says that a variable is undefined when
> I'm accessing it, even though to my understanding it's supposed to be
> defined at that point. I'm asking if I'm misunderstanding something, or
> should this be treated as a bug.
It's not a bug; variable expansion happens before redirections are performed.
The sequence is in
http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_09_01
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU address@hidden http://tiswww.cwru.edu/~chet/