A.cat file>filE.copy B.cat filefilE.copy C.&cat filefilE.copy D.&cat file>filE.copy
A.cp shell.shshell2.sh B.mv shell.shshell2.sh C.ls shell.sh>shell2.sh D.ll shell.sh>shell2.sh
A.umount B.dismount C.mount–u D.從/etc/fstab中刪除這個(gè)文件系統(tǒng)項(xiàng)