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Re: Severe Bash Bug with Arrays


From: Chet Ramey
Subject: Re: Severe Bash Bug with Arrays
Date: Wed, 25 Apr 2012 08:40:11 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:11.0) Gecko/20120327 Thunderbird/11.0.1

On 4/25/12 1:23 AM, Clark Wang wrote:

>> Bash Version: 4.2
>> Patch Level: 0
>> Release Status: release
>>
>> Description:
>>        Cannot redirect into an array from multiline variable
>>
>> Does not work:
>> echo "$mydata" | while read line; do myarray+=( "$line" ); done
>>
> 
> Here the whole *while* statement runs in a subshell. See
> http://mywiki.wooledge.org/BashPitfalls#grep_foo_bar_.7C_while_read_-r.3B_do_.28.28count.2B-.2B-.29.29.3B_done.

Since you're using bash-4.2, you can experiment with the `lastpipe' shopt
option.  If that's enabled, bash runs the last element of a pipeline in
the parent shell context without creating a subshell.

Chet
-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU    address@hidden    http://cnswww.cns.cwru.edu/~chet/



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