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Groups > gnu.bash.bug > #15194
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| From | Chet Ramey <chet.ramey@case.edu> |
| Newsgroups | gnu.bash.bug |
| Subject | Re: Unexpected result of array assignment |
| Date | Fri, 19 Jul 2019 15:21:45 -0400 |
| Lines | 37 |
| Approved | bug-bash@gnu.org |
| Message-ID | <mailman.1798.1563564870.2688.bug-bash@gnu.org> (permalink) |
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| To | "Darren 'Tadgy' Austin" <darren@afterdark.org.uk>, bug-bash@gnu.org |
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On 7/17/19 9:16 PM, Darren 'Tadgy' Austin wrote: > Bash Version: 5.0 > Patch Level: 3 > Release Status: release > > Description: > There seems to be unexpect (a bug?) behaviour with bash's handling of array assignments. > Specifically, if you try to assign an array element a value containing that same array value, it fails to work. > See example below :) > Bug confirmed by the folks in #bash on Freenode - unable to explain what is happening. Thanks for the report. This changed between bash-4.2 and bash-4.3 as part of changes to avoid scanning the subscript in an associative array reference multiple times: before and after expansion, and for compatibility with ksh93 (which behaves the same as bash-4.3+). It's obliquely referenced in the documentation: "When += is applied to an array variable using compound assignment (see Arrays below), the variable's value is not unset (as it is when using =)" However, I agree that it would be more consistent to let the expansion of the rhs use the existing value of the array before clearing it, since that's what indexed arrays do. I'll make associative array assignment do that. 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 result of array assignment Chet Ramey <chet.ramey@case.edu> - 2019-07-19 15:21 -0400
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