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POShell: How to replace something of a text with the saved variable value
 

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  1. POShell: How to replace something of a text with the saved variable value
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    <p>I saved a value by shell command: For example:</p> <pre><code>timeoutvalue=`echo "timeout=2.0"` </code></pre> <p>And I have to grep the value of timeout from another text, and replace it with this timeoutvalue. For example, the text is egtest:</p> <pre><code>&lt;host ip="255.255.255.0" name="testhost" description="hostfortest" connection="xmlrpc" timeout=4.0/&gt; </code></pre> <p>I want to grep the value of timeout from the above text and replace the value of <code>timeout=4.0</code> by <code>timeout=2.0</code>(the value I saved as variable by shell command).</p> <p>My problem is: (1)for a simple test, I want to replace the value of timeout=4.0 with $timeoutvalue. So my command is:</p> <p><code>sed 's/timeout=4.0/$timeoutvalue/g' egtext</code>.</p> <p>But it seems the text become:</p> <pre><code>&lt;host ip="255.255.255.0" name="testhost" description="hostfortest" connection="xmlrpc" $timeoutvalue/&gt; </code></pre> <p>Could anybody tell me why it is wrong?</p> <p>(2)For this problem, I have to first grep <code>timeout=4.0</code> from the text, and replace the value <code>4.0</code> to the saved variable value(in my example:2.0). I thought but I don't know which command to use to realize this(awk? sed?) Because the filed of the text isn't certain,(for example, in this text, timeout is in <code>$5</code>, but maybe in another text, it maybe changed into <code>$6</code>). I mean it may be changed into:</p> <pre><code>&lt;host ip="255.255.255.0" name="testhost" description="hostfortest" connection="xmlrpc" type="onebox" timeout=4.0/&gt; </code></pre> <p>Could anybody help me with this?</p>
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