A.crontab -lB.cron -l rootC.lscron -l rootD.cat var cro……

单项选择题Whichcronentrywillrun usr local bin myscriptat0500everySaturdayofthefollowing？（）

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

单项选择题Asystemadministratorwantstorunascriptcalledmyscript，butdoesnotwanttoseetheerrorsthatmightbegeneratedbythescript.Howwouldthisbeaccomplished？（）

A./usr/local/bin/myscript > /dev/null
B./usr/local/bin/myscript < /dev/null
C./usr/local/bin/myscript 2> /dev/null
D./usr/local/bin/myscript 1> /dev/null

单项选择题Whichcommandwillrunmyscriptandredirectstdoutandsterrto tmp myoutput？（）

A../myscript >> /tmp/myoutput
B../myscript 2>&1 /tmp/myoutput
C../myscript > /tmp/myoutput 2>&1
D../myscript > /tmp/myoutput &1>2

单项选择题Auser’sprintjobsdefaulttoPRINTER_A.TheuserwantstochangetheirdefaultprintertoPRINTER_B.Howcanthesystemadministratorchangetheuser’sdefaultprintertoPRINTER_B？（）

A.Execute the command ’piobe -q PRINTER_B’
B.Edit the user’s stanza in the /etc/qconfig file
C.Execute the command ’chuser -a QUEUE=PRINTER_B user’
D.Add the line ’export PRINTER=PRINTER_B’ to the user’s .profile

单项选择题A 1500 page print job was sent to the  pcl  queue. The job was running for several minutes before it was determined that the job was not needed. What can be done to delete the job？（）

A.kill 201
B.cancel 201
C.disable pcl
D.rm /var/spool/lpd/STDIN.27648