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+====== Passing parameters to a CGI script ======
+Some important points:
+  * The CGI script has to end with .cgi in the name
+  * It can be placed anywhere in your folder ''~/html''
+  * It has to have secure web permissions set -- run ''mkhomepg''
+  * CGI parameters are passed after ''?'' in the URL, for example: https://hangar118.sdf.org/cgi-bin/foo.cgi?a=1;b=2
+  * The CGI script gets the parameters via the environment variable ''QUERY_STRING''
+Example session:
+<code>
+# Folder for CGI scripts
+$ mkdir ~/html/cgi-bin
+# Create file such a this
+$ cat ~/html/cgi-bin/foo.cgi
+#!/usr/bin/bash
+echo 'Content-type: text/html'
+echo ''
+echo '<html>'
+echo '<head>'
+echo '<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">'
+echo '</head>'
+echo '<body>'
+echo '<p>Hello World!</p>'
+echo '<pre>'
+echo "Query (after '?' in the URL): ${QUERY_STRING}"
+echo "From: ${HTTP_USER_AGENT}"
+echo '</pre>'
+echo '</body>'
+echo '</html>'
+exit 0
+# Set executable attribute
+$ chmod +x foo.cgi
+# Set secure web permissions
+$ mkhomepg
+setting secure web permissions for /meta/www/h/hangar118
+% queing permissions to be set
+# Correct permissions would look like this
+$ ls -l ~/html/cgi-bin/
+total 4.0K
+-rwxr-x--- 1 hangar118 www-data 368 Jan  3 02:21 foo.cgi*
+</code>
+It can be invoked via https://hangar118.sdf.org/cgi-bin/foo.cgi?a=1;b=2
+Then, in the browser it will produce an output similar to this:
+<code>
+Hello World!
+Query (after '?' in the URL): a=1;b=2
+From: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/109.0
+</code>
+NOTE: The example session is from the MetaArray