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Re: Another ^A bug


From: Chet Ramey
Subject: Re: Another ^A bug
Date: Thu, 29 Nov 2018 15:31:10 -0800
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:52.0) Gecko/20100101 Thunderbird/52.9.1

On 11/20/18 9:24 AM, Martijn Dekker wrote:
> That ^A / $'\1' character just keeps causing trouble...
> 
> This is a bug with IFS. Including a $'\1' character anywhere in IFS causes
> expansions in shell assignments to discard that character.
> 
> $ bash -c "c=$'Y\1Y';
>     for IFS in $'\1' $'\2' $'x\1' $'x\2' $'\1x' $'\2x'; do
>         v=X\${c}X;
>         printf %s \"\$v\" | od -a | awk 'NR==1 { \$1=\"\"; print }';
>     done"

Thanks for the report. Cases like this never come up in the real world,
so edge cases like this slip by.

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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