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Full Discussion: Triggering UNIX command from Web Browser
Operating Systems Solaris Triggering UNIX command from Web Browser Post 302404675 by hergp on Wednesday 17th of March 2010 03:14:24 AM
Old 03-17-2010
OK, here is a working example:

First you need a html page with form(s), lets call it test.html and you put it into the document root of the server:
Code:
<html><head><title>Test Form</title></head>
<body>
  <form action="/cgi-bin/test.cgi" method="get">
    input for GET: <input name="get_input">
    <input type=submit value="Submit via GET">
  </form>
  <form action="/cgi-bin/test.cgi" method="post">
    input for POST: <input name="post_input">
    <input type=submit value="Submit via POST">
  </form>
  </body>
</html>

Next you need a cgi-script. I choose a shellscript using the kornshell. You save it as "test.cgi" into the cgi-bin directory of your webserver.
Code:
#!/bin/ksh
print "Content-type: text/plain\r\n\r"
print "my query string from (GET) is \"$QUERY_STRING\""
print "\nmy stdin (from POST) is"
cat

When you open the test.html page in your browser, you can enter a string into one of the two input fields and press the submit button adjacent to it.

When you press the "Submit via GET" button, you effectively call /cgi-bin/test.cgi?get_input=your_input_string and the browser shows this output:
Code:
my query string from (GET) is "get_input=your_input_string"
my stdin (from POST) is

When you press the "Submit via POST" button, your input is sent to the stdin of the cgi-script.
Code:
my query string from (GET) is ""
my stdin (from POST) is
post_input=your_input_string

What's left for you to do is: receive the actual user's input either via GET or POST and then process the input according to your needs.

I hope, this helps to understand what's going on.
Last edited by hergp; 03-17-2010 at 04:21 AM..
 

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LEARN ABOUT DEBIAN

cgi

cgi(5)								Programmer's Manual							    cgi(5)

NAME

       cgi - Common Gateway Interface

DESCRIPTION

       The  Common  Gateway Interface is a way to create dynamic web pages.  It defines rules for interaction between a program and the web server
       while the server talks to the client.  There are some ways to use it.

ENVIRONMENT

       Normally the webserver sets several environment variables to give some information to the CGI program so it can determine various stuff.

       AUTH_TYPE
	      This reflects the authentification method used to validate a user.

       CONTENT_LENGTH
	      The length of the data in bytes passed to the CGI program through standard input.  This is used by the POST method.

       CONTENT_TYPE
	      The MIME type of the query data, such as "text/html", optional.

       DOCUMENT_ROOT
	      This reflects the document root directory of the webserver.

       GATEWAY_INTERFACE
	      Reflects the version of the Common Gateway Interface that the server is using

       HTTP_ACCEPT
	      A comma separated list of MIME type that the client is willing to accept.

       HTTP_FROM
	      The email address of the user issuing the information request.  This is not supported by most browsers.

       HTTP_REFERER
	      Reflects the URL from which this CGI program was accessed.

       HTTP_USER_AGENT
	      The name, version and libraries of the browser making the request.  This information can be used to  determine  if  the  browser	is
	      capable of graphics and is able to display frames and tables.

       PATH_INFO
	      This shows extra information that was passed to the CGI program via command line.  Normally it's empty or non-existent.

       PATH_TRANSLATED
	      The translated path on the local filesystem.

       QUERY_STRING
	      This variable refers to additional arguments that were appended to the CGI program - normally with the '?' sign.

       REMOTE_ADDR
	      This refers to the host from which the information request was issued, as IP number.

       REMOTE_HOST
	      This refers to the host from which the information request was issued.

       REMOTE_USER
	      The authenticated name of the user.

       REQUEST_METHOD
	      This refers to the method with which the information request was issued.	Normally this is either GET or POST.

       SCRIPT_NAME
	      The virtual name of the script being executed.

       SERVER_NAME
	      The  server's  hostname  or IP number.  This may be used to determine the correct paths or resulting HTML code for CGI programs that
	      are used on the same machine for several servers.

       SERVER_PROTOCOL
	      This is the name and version of the information protocol the request came in with.  Normally this is "HTTP/1.0" or "HTTP/1.1".

       SERVER_PORT
	      This refers to the TCP/IP port on which the webserver is running.

       SERVER_SOFTWARE
	      This reflects the name and revision of the webserver software.

AUTHOR

       This CGI library is written by Martin Schulze <joey@infodrom.org>.  If you have additions or improvements please get in touch with him.

SEE ALSO

       cgiDebug(3), cgiHeader(3), cgiSetType(3), cgiSetHeader(3), cgiGetValue(3), cgiGetVariables(3).

CGI Library							   6 April 2008 							    cgi(5)
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