A.umount B.ineted C.unmount D.mount
A.more-20/home/abC.txt B.less-20/home/abC.txt C.head-20/home/abtxt D.ls-20/home/abC.txt
A.rpmdhcp.3.0pl1-23.i386.rpm B.rpm-ivhdhcp.3.0pl1-23.i386.rpm C.setupdhcp D.rpm-qvhdhcp.3.0pl1-23.i386.rpm