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单选题
How would a system administrator review root’s current cron jobs of the following？（）
A
crontab -l
B
cron -l root
C
lscron -l root
D
cat /var/cron/crontabs/root
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单选题A System p administrator suspects they are receiving an error from one of their nightly cron jobs. The job is： 0 1 * * * /usr/local/bin/nightlycheck.pl Where should the administrator first look for errors reported by this cron job（）A
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单选题An operator wants to view all the scheduled jobs on a system. Which of the following locations would house scheduled jobs?（）A
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单选题A small company would like help in identifying an apparent system performance problem on its internal mail server， especially to determine peak hour usage. What would be the first step in identifying the problem？（）A
cd /var/spool/cron/crontabs，uncomment the lines in the adm file， in order to start gathering statistics.B
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