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Re: AW: Misbehavior with constants and bash script
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From: |
Chet Ramey |
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Subject: |
Re: AW: Misbehavior with constants and bash script |
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Date: |
Tue, 20 Nov 2018 09:39:43 -0500 |
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User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:60.0) Gecko/20100101 Thunderbird/60.3.1 |
On 11/20/18 6:38 AM, Alexander Reintzsch wrote:
> and if I add an empty command after the assignment statement it behaves as
> expected.
>
> echo "A"
> declare -r vconst="I am fixed."
> echo "B"
> vconst="new value" : # please note the : at the end. (no operation command)
> echo "C" # now printed
I would use `true'. `:' is a special builtin, and a POSIX interpretation
clarified that a non-interactive shell is supposed to exit if a variable
assignment error occurs when the assignment precedes a special builtin.
--
``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/