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Re: read output of process into a variable

From: Stefan Palme
Subject: Re: read output of process into a variable
Date: 31 Jan 2008 07:10:46 GMT
User-agent: Pan/0.132 (Waxed in Black)

On Wed, 30 Jan 2008 13:44:47 -0700, Bob Proulx wrote:
> Stefan Palme wrote:
>> don't know if this is the right newsgroup, but it's the only one I can
>> find with "bash" in its name :-)
> That newsgroup is gatewayed to the bug-bash mailing list.
>> I want to do something like this:
>>   result=""
>>   /usr/bin/output_generator | while read line; do
>>     extracteddata=`echo "$line" | sed -e 's/X/Y/'` result="$result
>>     $extracteddata"
>>   done
>>   /usr/bin/another_tool "$result"
>> In the last line is "result" as empty as at the start of the whole
>> thing - I guess because the inner "while" loop is executed in a
>> subshell, so that changing the value of "result" in this loop does not
>> affect the "outer result".
> Please See the Bash FAQ question E4 for more information describing this
> problem.

Thanks, I've understood the problem and solved it.
And sorry for asking this FAQ on the wrong NG.


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