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Re: Command substitution before while loop


From: Chet Ramey
Subject: Re: Command substitution before while loop
Date: Wed, 1 Apr 2020 14:20:32 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:68.0) Gecko/20100101 Thunderbird/68.5.0

On 4/1/20 1:47 PM, Andreas Schwab wrote:
> On Apr 01 2020, Krystian Wojtas via Bug reports for the GNU Bourne Again 
> SHell wrote:
> 
>>         Making comments in pipes using command substitution is very helpful. 
>> But there is syntax error it it is done just before while loop. Could it be 
>> considered as bug?
> 
> Not a bug.  Reserved words are only recognized at the start of a
> command, before any expansions.  For the same reason a compound command
> cannot be preceded by redirections.

Yes, and also please note that the historical `` form of command
substitution isn't guaranteed to be able to parse arbitrary commands.
Use $(...) for that.

Chet

-- 
``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/



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