bug-bash
[Top][All Lists]
Advanced

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [here string] uncompatible change on here string function


From: Chet Ramey
Subject: Re: [here string] uncompatible change on here string function
Date: Wed, 22 Nov 2017 21:05:51 -0500
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:52.0) Gecko/20100101 Thunderbird/52.4.0

On 11/22/17 8:17 PM, PePa wrote:
> On 11/23/2017 02:23 AM, Chet Ramey wrote:
>> The bash-4.2 man page defers the description of here strings to the
>> description of here documents. The lines in a here document do not undergo
>> word splitting.  It was a bug in bash-4.2 that the WORD in a here string
>> was split.
>>
>> This finally got fixed in bash-4.4, as described by this CHANGES entry:
>>
>> z.  Bash no longer splits the expansion of here-strings, as the
>> documentation
>>      has always said.
> 
> I would think it is useful (and according to how things work in general) to
> have a different behavior for <<<"$a" and <<<$a
> 
> If one wants to have all line-breaks, spaces and tabs preserved, use
> <<<"$a" otherwise use <<<$a

Here strings are, as the documentation says, a variant of here documents.
There should be no behavioral difference between

v=$'abc\tdef'

cat <<EOF
$v
EOF

and

cat <<<$v

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



reply via email to

[Prev in Thread] Current Thread [Next in Thread]