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Re: read output of process into a variable
From: |
Bob Proulx |
Subject: |
Re: read output of process into a variable |
Date: |
Wed, 30 Jan 2008 13:44:47 -0700 |
User-agent: |
Mutt/1.5.13 (2006-08-11) |
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.
Bob