单项选择题
A.crontab -l B.cron -l root C.lscron -l root D.cat /var/cron/crontabs/root
Whichcronentrywillrun/usr/local/bin/myscriptat0500every...
单项选择题Which cron entry will run /usr/local/bin/myscript at 0500 every Saturday of the following？（）
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
Asystemadministratorwantstorunascriptcalledmyscript，but...
单项选择题A system administrator wants to run a script called myscript， but does not want to see the errors that might be generated by the script. How would this be accomplished？（）
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
Whichcommandwillrunmyscriptandredirectstdoutandsterrto/...
单项选择题Which command will run myscript and redirect stdout and sterr to /tmp/myoutput？（）
A../myscript >> /tmp/myoutput B../myscript 2>&1 /tmp/myoutput C../myscript > /tmp/myoutput 2>&1 D../myscript > /tmp/myoutput &1>2
