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    <ol> <li><p>Add the shebang line to the top of the script:</p> <pre><code>#!/bin/bash </code></pre></li> <li><p>Variable assignment is done without the dollar sign:</p> <pre><code>installerver=1.1 </code></pre></li> <li><p>Variable assignment from a subshell command uses parenthesis not braces:</p> <pre><code>installedver=$(cat /var/www/html/gvsms/.version) </code></pre></li> <li><p>There's a bad <code>fi</code> in your if block</p></li> <li>You're missing an <code>else</code> block</li> <li>You should probably test if the file exists before cat'ing it.</li> <li>You should double-quote all your variables</li> <li>You need spaces inside conditional brackets <code>[ … ]</code> and <code>[[ … ]]</code></li> </ol> <p>This will get your code running:</p> <pre><code>#!/bin/bash installerver="1.1" echo "Installation beginning...." echo " " echo " " echo -n "Checking to see if GVoice SMS Notification System was previously installed..." if [ -e "/var/www/html/gvsms/index.php" -a -r "/var/www/html/gvsms/.version" ]; then echo "Yes." echo "" echo "I have detected a previous installation of GVoice SMS Notification System." if [ "$(cat /var/www/html/gvsms/.version)" == "$installedver" ]; then echo "The GVoice SMS Notification System is currently installed and is the same version as this installer. If you were trying to upgrade, please check the installer you downloaded and try again." exit elif [ "$installedver" == "0.5" || "$installedver" == "1.0" ]; then while [[ "$yn" != "Yes" &amp;&amp; "$yn" != "Y" &amp;&amp; "$yn" != "y" &amp;&amp; "$yn" != "yes" ]]; do echo "Would you like to upgrade? Yes or no." read -r upgrade echo "$upgrade upgrade?" echo "Is this correct? (Yes or No)" read yn done echo "Upgrade proceeding..." fi else echo "No." echo "I have not detected a previous installation of GVoice SMS Notification System." read -p "To proceed with installation at your own risk, press Enter. Otherwise Ctrl-C." fi </code></pre>
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    1. COLooks awesome! Thanks! But, it still doesn't work. `Installation beginning.... Checking to see if GVoice SMS Notification System was previously installed...Yes. I have detected a previous installation of GVoice SMS Notification System. ./test.x: line 15: [: missing `]' ./test.x: line 15: : command not found ` Grr. The code markup is messing with the error. Should be missing `]'
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    2. CO@Ross: You were also missing a space before the closing bracket.
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