Crontab kayan aiki ne akan CentOS tsarin aiki wanda ke ba ku damar tsara ayyuka masu maimaitawa a ƙayyadadden lokaci. Anan akwai umarnin don amfani crontab akan CentOS:
Mataki 1: Buɗe crontab don mai amfani na yanzu
Don buɗewa crontab ga mai amfani na yanzu, gudanar da umarni mai zuwa:
crontab -e
Mataki na 2: Fahimtar crontab haɗin kai
Kowane layi a cikin crontab yana wakiltar takamaiman aikin da aka tsara.
Maganar crontab ita ce kamar haka:
* * * * * command_to_be_executed
-- -- -
|| || |
|| || ----- Day of the week(0- 7)(Sunday is 0 and 7)
|| | ------- Month(1- 12)
|| --------- Day of the month(1- 31)
| ----------- Hour(0- 23)
------------- Minute(0- 59)
Alamar alama(*) tana nufin duk ƙimar ƙimar wannan filin.
Mataki 3: Ƙayyade ayyuka a cikin crontab
Misali, don gudanar da rubutun mai suna "myscript.sh" a 1 AM kowace rana, ƙara layin mai zuwa zuwa crontab:
0 1 * * * /path/to/myscript.sh
Mataki 4: Ajiye kuma fita
Bayan ƙara ayyuka zuwa crontab, ajiye kuma fita ta latsawa Ctrl + X, sannan ka buga Y kuma latsa Enter.
Mataki na 5: Duba crontab
Don duba jerin ayyuka a cikin crontab, gudanar da umarni mai zuwa:
crontab -l
Mataki na 6: Cire wani aiki daga crontab
o cire aiki daga crontab, gudanar da umarni mai zuwa:
crontab -r
Lura: Yi hankali lokacin amfani crontab, tabbatar da daidaitawa da lokacin tsarawa daidai ne don guje wa lalacewar tsarin ko kitsewa.