Hello World

Here is a "Hello, World!" web application written using W3:

#!/usr/bin/tclsh
package require w3
proc w3-default {} {
  w3-subst {<h1>Hello, World!</h1>\n}
}
w3-start $argv

To run this application using the built-in web-server, store the code above in a file (here we use the name "hello.tcl") and do:

tclsh hello.tcl

To run the app using the built-in web-server bound to all TCP addresses and listening on port 8080, use:

tclsh hello.tcl --server 8080

To run the app as an SCGI server listening on port 9001:

tclsh hello.tcl --scgi 9001

To run the application as CGI, make the hello.tcl file executable and move it into the appropriate directory of the web server.

Further Information

• Introduction To Writing W3 Applications
• Quick Reference
• W3 Parameters
• W3 Commands
• URL Mapping
• Security Features
• How To Compile w3tclsh - Or Not
• Limitations of W3
• Example Applications
• Real-World Uses Of W3
• Debugging Hints