poff -v (return code: 0)
poff -h (return code: 0)
usage: /usr/bin/poff [option] [provider] options: -r Cause pppd to drop the line and redial. -d Toggle the state of pppd's debug option. -c Cause pppd to renegotiate compression. -a Stop all pppd's. 'provider' will be ignored. -h Print this help summary and exit. -v Print version and exit. none Stop pppd. Options may not be combined. If 'provider' is omitted pppd will be stopped or signalled if and only if there is exactly one running unless the '-a' option was given. If 'provider' is supplied the pppd controlling the connection to that provider will be stopped or signalled.