A.y B.d C.s D.p
A.grep"IPADDR$"/etc/sysconfig/network-scripts/ifcfg-eth0 B.grep"IPADDR#"/etc/sysconfig/network-scripts/ifcfg-eth0 C.grep"!IPADDR"/etc/sysconfig/network-scripts/ifcfg-eth0 D.grep"^IPADDR"/etc/sysconfig/network-scripts/ifcfg-eth0
A.sed"root"/etc/passwd B.grep-ni"ROOT"/etc/passwd C.grep-v"root"/etc/passwd D.awk"root"/etc/passwd