A.A network problemB.corrupted filesystemC.corrupted OD……

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

单项选择题A System p administrator needs to run the annualreval.sh script， directing standard error to  var log reval.err， and appending standard out to  var log reval.log.  How can this be accomplished （）

A.annualreval.sh 2>&1 /var/log/reval.log 2> /var/log/reval.err
B.annualreval.sh 1>/var/log/reval.log 2>/var/log/reval.err
C.annualreval.sh 2>>&1 /var/log/reval.log /var/log/reval.err
D.annualreval.sh 1>>/var/log/reval.log 2>/var/log/reval.err