A System p administrator is attempting to restore some files from a backup tape. The restore failed. The system administrator suspects the block size of the tape drive is incorrect. 
Which of the following commands can be used to determine the block size of the backup tape （）

单项选择题During system boot， the boot process hangs at LED 0551.  Which of the following is a likely cause（）

A.A network problem
B.corrupted filesystem
C.corrupted ODM
D.corrupted /etc/inittab file

单项选择题Whichcronentrywillrun usr local bin myscriptat0500everySaturday（）

A.5 0 * * 6 /usr/local/bin/myscript
B.6 * * 5 0 /usr/local/bin/myscript
C.0 5 * * 6 /usr/local/bin/myscript
D.0 5 6 * * /usr/local/bin/myscript

单项选择题A System p administrator wants to NFS mount a filesystem from server  alpha  to server  bravo .  Which of the following commands should be issued from  bravo  to determine which filesystems are being exported by server  alpha （）

A.lsexport alpha
B.showmount -e alpha
C.exportfs -l alpha
D.mount -e nfs alpha

单项选择题A System p administrator wishes to create a template file to monitor performance. Having found a template from January，  how can the administrator create a July template without destroying the original January version （）

A.vi jan.template ：%s/Jan/Jul/g ：w jul.template ：q!
B.cat jan.template sed s：Jan：Jul： > jan.template
C.vi jan.template ：1，$ replace Jan Jul [Esc] ZZ
D.vi jan.template ：w jul.template ：1，$ s/Jan/Jul/g ：q!

单项选择题A System p administrator has just installed a new technology level， but  oslevel -r  does not show the expected technology level.  Which of the following commands would determine which filesets are downlevel（）

A.lppchk
B.instfix
C.oslevel
D.installp