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Re: [ ! ! hey ] -> [: too many arguments

From: Chet Ramey
Subject: Re: [ ! ! hey ] -> [: too many arguments
Date: Thu, 23 Jun 2022 10:53:00 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:91.0) Gecko/20100101 Thunderbird/91.10.0

On 6/23/22 9:39 AM, Steffen Nurpmeso wrote:

I stumbled over a bug in the MUA i maintain, and when checking
against what shells do with lonely unary ! i then came to this:

   #?0|kent:tmp$ dash -c 'if [ ! ! hey ]; then echo du; fi'
   #?0|kent:tmp$ bash -c 'if [ ! ! hey ]; then echo du; fi'
   bash: line 1: [: too many arguments
   #?0|kent:tmp$ busybox.static sh -c 'if [ ! ! hey ]; then echo du; fi'

Thanks for the report. This appears to have existed for over thirty years,
and you're the first one to report it.


``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    chet@case.edu    http://tiswww.cwru.edu/~chet/

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