(PHP 3, PHP 4 )
passthru -- Execute an external program and display raw output
void passthru ( string command [, int return_var])
The passthru() function is similar to the exec() function in that it executes a command . If the return_var argument is present, the return status of the Unix command will be placed here. This function should be used in place of exec() or system() when the output from the Unix command is binary data which needs to be passed directly back to the browser. A common use for this is to execute something like the pbmplus utilities that can output an image stream directly. By setting the Content-type to image/gif and then calling a pbmplus program to output a gif, you can create PHP scripts that output images directly.
comment: <- if you want to create images with PHP scripts, check out gdlib
<?php passthru("ddate") ?>
<-a must have on your webpage..the discordian date inserted in an most easy way
Click here to shutdown the server.. passthru("shutdown -h now") ...ehhh :)