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Re: [Help-bash] Arithmetic evaluation / expansion question
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From: |
Chet Ramey |
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Subject: |
Re: [Help-bash] Arithmetic evaluation / expansion question |
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Date: |
Thu, 11 Oct 2018 10:26:46 -0400 |
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User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 |
On 10/10/18 12:47 PM, Bruce Hohl wrote:
> An arithmetic evaluation / expansion question please: the man page
> indicates that base 10 is the default, and null or unset variables evaluate
> to zero.
>
> Are strings also evaluated to zero within $(( ))?
Expressions that resolve to unset variables (since a token that looks
like a shell identifier is treated as a variable name) evaluate to 0.
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU address@hidden http://tiswww.cwru.edu/~chet/
- Re: [Help-bash] Arithmetic evaluation / expansion question, (continued)
- Re: [Help-bash] Arithmetic evaluation / expansion question, Andy Chu, 2018/10/10
- Re: [Help-bash] Arithmetic evaluation / expansion question, Bruce Hohl, 2018/10/10
- Re: [Help-bash] Arithmetic evaluation / expansion question, Andy Chu, 2018/10/10
- Re: [Help-bash] Arithmetic evaluation / expansion question, Bruce Hohl, 2018/10/10
- Re: [Help-bash] Arithmetic evaluation / expansion question, Quentin L'Hours, 2018/10/10
- Re: [Help-bash] Arithmetic evaluation / expansion question, Bruce Hohl, 2018/10/10
- Re: [Help-bash] Arithmetic evaluation / expansion question, Chet Ramey, 2018/10/11
- Re: [Help-bash] Arithmetic evaluation / expansion question, Chet Ramey, 2018/10/11
Re: [Help-bash] Arithmetic evaluation / expansion question, Chet Ramey, 2018/10/11
Re: [Help-bash] Arithmetic evaluation / expansion question,
Chet Ramey <=