[DGD] system() command

[Par Winzell]

> There's some way to use the system() comand to get the result to the mud??
> 
> For example system("ls"); and get the output to a variable in the mud

Definitely not. There are two workable methods. In one, you write a little 
servlet in Perl or somesuch that communicates with DGD over the network. It 
can accept requests such as 'perform an ls and return the result'.

A slightly simpler and much dirtier method is to use files in a directory 
and another little servlet that polls for such files continously. For 
example if you want the output of 'ls' you could have DGD write a file 
called /sysreq/485.req (or whatever) with the word 'ls' in it; the external 
Perl process could perform the command and channel output to 
/sysreq/485.out, which in turn DGD could write.

The latter method requires polling both by the servlet process and by DGD 
whereas the first one can be entirely callback-based. If you run a DGD with 
only the telnet/binary port combo, however, you'll use up one of those for 
this purpose (unless you do some fancy multiplexing).

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