There are differences in the flags, depending on the OS. On some UNIX variants, "ps -ef" = "ps -a". This is why "man ps" is so usefull...
Here's another;
netstat -ina
ifconfig -a
traceroute ip addy -or- hostname
ping ip addy -or- hostname
flood ip addy -or- hostname <- USE THIS AT YOUR OWN RISK AS IT DOES _JUST_ WHAT IT SAYS, flood the ip addy -or- hostname with pings... useful for testing...