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    <p>Normally, on *nix based systems, commands return a 0 value for success and non zero value if the command was unsuccessful. In the shell, the exit status of the last command gets stored in the "$?" variable. </p> <p>So, lets say you run your make install and check the exit status like so:</p> <pre><code># make install # echo $? </code></pre> <p>If the command was successful, the echo statement will print out a 0, otherwise you will get some other numerical value. Alternatively you can then test the contents if the $? with "if".</p> <pre><code>if [ $? -eq 0 ]; then { echo "OK" };else { echo "Not Ok" };fi </code></pre> <p>You can also use the exit status in a different way. The following command line will execute each command, in order ONLY if the preceding command was successful</p> <pre><code>./configure &amp;&amp; make &amp;&amp; make install &amp;&amp; echo "All good!" </code></pre> <p>Think of each COMMAND as a FUNCTION that returns a VALUE (its exit status)</p> <p>&amp;&amp; is the AND operator for bash (The shell you are probably using.) and || is the OR operator. </p> <p>You can extend the above command line to also handle the case where the "make install" step fails, for example:</p> <pre><code>./configure &amp;&amp; make &amp;&amp; make install &amp;&amp; echo "All good!" || echo "Something's awry" </code></pre> <p>Of course, this is just an example, but I think that you can solve your problem by taking advantage of the fact that you can test the exit status of commands. </p> <p>This link should help you: <a href="http://tldp.org/LDP/abs/html/exit-status.html" rel="nofollow">http://tldp.org/LDP/abs/html/exit-status.html</a></p>
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    1. COThe script has been working correctly for 6 months. Last night a member of my team tested it on a new server and it failed. But I think its one of those cases it was destined to fail. Anyway, thank you very much, this give me some room to improve it :)
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