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| From | Chet Ramey <chet.ramey@case.edu> |
| Newsgroups | gnu.bash.bug |
| Subject | Re: Unexpected history expanded in heredoc in $() or <() |
| Date | Mon, 1 Jun 2020 14:43:27 -0400 |
| Organization | ITS, Case Western Reserve University |
| Lines | 27 |
| Approved | bug-bash@gnu.org |
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| To | ladyrick <ladyrick@qq.com>, bug-bash <bug-bash@gnu.org>, bash <bash@packages.debian.org> |
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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 chet@case.edu http://tiswww.cwru.edu/~chet/
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Re: Unexpected history expanded in heredoc in $() or <() Chet Ramey <chet.ramey@case.edu> - 2020-06-01 14:43 -0400
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