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diff --git a/docs/cgi/cl.html b/docs/cgi/cl.html new file mode 100644 index 0000000..5779d62 --- /dev/null +++ b/docs/cgi/cl.html @@ -0,0 +1,46 @@ +<html><head><title>CGI Command line options</title></head><body><h1><img alt="" src="cl_files/CGIlogo.gif"> CGI Command line options</h1> +<hr> <p> + +</p><h2>Specification</h2> + +The command line is only used in the case of an ISINDEX query. It is +not used in the case of an HTML form or any as yet undefined query +type. The server should search the query information (the <code>QUERY_STRING</code> environment variable) for a non-encoded += character to determine if the command line is to be used, if it +finds one, the command line is not to be used. This trusts the clients +to encode the = sign in ISINDEX queries, a practice which was +considered safe at the time of the design of this specification. <p> + +For example, use the <a href="http://hoohoo.ncsa.uiuc.edu/cgi-bin/finger">finger script</a> and the ISINDEX interface to look up "httpd". You will see that the script will call itself with <code>/cgi-bin/finger?httpd</code> and will actually execute "finger httpd" on the command line and output the results to you. +</p><p> +If the server does find a "=" in the <code>QUERY_STRING</code>, +then the command line will not be used, and no decoding will be +performed. The query then remains intact for processing by an +appropriate FORM submission decoder. +Again, as an example, use <a href="http://hoohoo.ncsa.uiuc.edu/cgi-bin/finger?httpd=name">this hyperlink</a> to submit <code>"httpd=name"</code> to the finger script. Since this <code>QUERY_STRING</code> +contained an unencoded "=", nothing was decoded, the script didn't know +it was being submitted a valid query, and just gave you the default +finger form. +</p><p> +If the server finds that it cannot send the string due to internal +limitations (such as exec() or /bin/sh command line restrictions) the +server should include NO command line information and provide the +non-decoded query information in the environment +variable <a href="http://hoohoo.ncsa.uiuc.edu/cgi/env.html#query"><code>QUERY_STRING</code></a>. </p><p> +</p><hr> +<h2>Examples</h2> + +Examples of the command line usage are much better <a href="http://hoohoo.ncsa.uiuc.edu/cgi/examples.html">demonstrated</a> than explained. For these +examples, pay close attention to the script output which says what +argc and argv are. <p> + +</p><hr> + +<a href="http://hoohoo.ncsa.uiuc.edu/cgi/interface.html"><img alt="[Back]" src="cl_files/back.gif">Return to the +interface specification</a> <p> + +CGI - Common Gateway Interface +</p><address><a href="http://hoohoo.ncsa.uiuc.edu/cgi/mailtocgi.html">cgi@ncsa.uiuc.edu</a></address> + + +</body></html>
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