单项选择题
A.p B.c C.s D.l
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.从/etc/fstab中删除这个文件系统项
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