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Re: [Help-bash] Bug? Explanation??
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From: |
Chet Ramey |
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Subject: |
Re: [Help-bash] Bug? Explanation?? |
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Date: |
Sat, 31 Dec 2016 12:06:00 -0500 |
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User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:45.0) Gecko/20100101 Thunderbird/45.6.0 |
On 12/30/16 11:07 PM, Grisha Levit wrote:
> On Fri, Dec 30, 2016 at 11:03 PM, PePa <address@hidden
> <mailto:address@hidden>> wrote:
>
> r=23; echo $r; echo -e "r=bc\necho $r" |bash
>
> You need to escape the |$| in the second echo statement so that |$r| is not
> evaluated to |23| before being echoed.
The easiest way to see what bash gets on its standard input is to replace
`bash' in the pipeline with `cat'.
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU address@hidden http://cnswww.cns.cwru.edu/~chet/