On 5/29/20 11:59 AM, ladyrick wrote:
> Bash Version: 4.4
> Patch Level: 12
> Release Status: release
>
>
> Description:
> A heredoc starts with "cat <<'EOF'" is expected to not expand anything
> just like in a single quote string. But when this heredoc is in a $() or <(),
> history is expanded.
It's an interesting question. While quoted here-document delimiters do
suppress expansion, unquoted delimiters result in expansion similar to
double quotes, and double quotes don't suppress history substitution.
Yet, when not in a command substitution, history substitution is never
performed on the lines in a here-document.
But consistency is important, and I agree that the expansion should not
take place while parsing command or process substitutions, whether or not
the delimiter is quoted.
Chet
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU [email protected] http://tiswww.cwru.edu/~chet/
