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GETCGI
CGI (Common Gateway Interface) is a standard for data exchange between a web server and third party software. Server-side CGI scripts can be written in many languages and may be used to generate dynamic web content, call other programs, and other tasks.
The GETCGI command calls a server script and runs another job if the script cannot be started.
CHECKHTML checks if an HTML page exists on a server. If the call does not return with HTTP status "200 OK", another job is run.
The CHECKURL command checks if a domain is reachable, and otherwise calls another Z-Cron job. This command can be used to check if there is an internet connection, e.g. by testing if the Google homepage is reachable.
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