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