单项选择题
A. /etc/var/spool
B. /var/spool/cron
C. /var/sched/jobs
D. /usr/sched/crontabs
单项选择题 An operator wants to move all files inside the directory /home/operator to the current directory. Which of the following commands will complete the task?（）
单项选择题 Which of the following commands will list available paging space on a system?（）
单项选择题 Operator needs to remove all leading comments # from shell.script file. Which of the following vi sub-command can achieve this?（）