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Re: here-documents in $(command) substitution


From: Chet Ramey
Subject: Re: here-documents in $(command) substitution
Date: Mon, 28 Nov 2016 14:00:53 -0800
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:45.0) Gecko/20100101 Thunderbird/45.5.0

On 11/27/16 9:51 AM, Eduardo Bustamante wrote:

> Delimiter (in your case the three character string "EOF"), has to be
> on its own line, with no leading or trailing blanks (or any other
> characters). If bash 3.x used to behave different, it's because it was
> buggy.

Not exactly.  Bash has always supported the Bourne shell extension of
allowing the command substitution terminator to delimit a here document.

> Hence, the proper way to do a here-document inside command substitution:
> 
>     hp% cat hd
>     export foo=$(cat <<EOF
>     echo bar
>     EOF
>     )

This is true and obeys the letter of the standard.

Chet
-- 
``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/



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