A.sh B.bash C.csh D.ksh
A.rup-5 B.last reboot|head-10|grep’system boot’ C.who -r |head-5 D.uptime - a |tail-5
A.route add–net 192.168.1.0 gw 192.168.1.1netmask 255.255.255.0metric1 B.route add–net 172.16.1.0 gw 192.168.1.1netmask 255.255.255.255metric1 C.route add–net 172.16.1.0 gw 172.16.1.1netmask 255.255.255.0metric1 D.route adddefault 192.168.1.0 netmask 172.168.1.1metric1