+- disk_total (disk usage in percent) [argument: mountpoint]
+- disk_used (disk usage in percent) [argument: mountpoint]
+- entropy (available entropy) [argument: NULL]
+- gid (gid of current user) [argument: NULL]
+- hostname [argument: NULL]
+- ip (ip address) [argument: interface]
+- ram_free (ram usage in percent) [argument: NULL]