????cron ????? Linux ?μ?????й??????????????????????????????????????????? cron ???? crontab ??????????????????????????????
????contab ???????????????????? cron ??????
??????Ubuntu ????????????? service ??????? cron ????
????service cron status???? # ?? cron ??????
????service cron start??????# ??? cron ????
????service cron stop?????? # ?? cron ????
????service cron restart????# ???? cron ????
????service cron reload???? # ??????? cron ????????
????crontab ????
??????????
????crontab [-u user] file
????crontab [-u user] [-l | -r | -e] [-i] [-s]
???????????
????-u
??????????
????-l
???????????? crontab ????????
????-r
???????????? crontab ????????
????-e
??????????? crontab ???????????????????????????????
????-i
????????? crontab ?????????????????
????crontab ???
?????????minute hour day_of_month month day_of_week command

???????
????a) ??? cron ????
????huey@huey-K42JE:~/huey/linux/cmdline$ echo "*/3 * * * * date >> ~/huey/linux/cmdline/cron.out" > mycron
????huey@huey-K42JE:~/huey/linux/cmdline$ crontab mycron
????b) ??? cron ????
????huey@huey-K42JE:~/huey/linux/cmdline$ crontab -r
????c) ??? cron ????
????huey@huey-K42JE:~/huey/linux/cmdline$ crontab -l
????*/3 * * * * date >> ~/huey/linux/cmdline/cron.out