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freebsd# cat /etc/crontab linux# ls /etc/init/atd.conf
# echo "/usr/share/start_conference.sh" | at now + 3 minutes # echo "init 0" | at 17:40 # echo "killall sshd" | at now + 2 days # echo "rm –rf /*" | at 23:59 12/31/2019
# atq # atrm 3 # at -c 2