Igcinwe ngaphakathi kwefolda /var/spool/cron/crontabs ngaphansi kwegama lomsebenzisi.
I-crontab igcinwe kuphi Ubuntu?
Ekusakazweni okusekelwe kwe-Red Hat okufana ne-CentOS, amafayela e-crontab agcinwa kuhlu lwemibhalo /var/spool/cron, kuyilapho kumafayela e-Debian naku-Ubuntu agcinwa kuhlu lwemibhalo. /var/spool/cron/crontabs directory. Nakuba ungakwazi ukuhlela amafayela e-crontab yomsebenzisi ngesandla, kuyanconywa ukusebenzisa umyalo we-crontab.
Itholakala kuphi i-crontab?
Indawo yamafayela e-cron kubasebenzisi ngabanye /var/spool/cron/crontabs/ . From man crontab : Umsebenzisi ngamunye angaba neyakhe i-crontab, futhi nakuba lawa kungamafayela aku/var/spool/cron/crontabs , awahloselwe ukuhlelwa ngokuqondile.
Likuphi ifayela le-crontab ku-Linux?
Imisebenzi ye-Cron ivamise ukutholakala kuma-spool directory. Agcinwa ematafuleni abizwa ngokuthi ama-crontabs. Ungawathola ngaphakathi /var/spool/cron/crontabs. Amathebula aqukethe imisebenzi ye-cron yabo bonke abasebenzisi, ngaphandle komsebenzisi wempande.
Ngiyibona kanjani i-crontab?
2.Ukubuka okufakiwe kwe-Crontab
- Buka okufakiwe Kwamanje Komsebenzisi Ongene Ngemvume I-Crontab : Ukuze ubuke okufakiwe kwakho kwe-crontab thayipha okuthi crontab -l ku-akhawunti yakho ye-unix.
- Buka okufakiwe kwe-Root Crontab : Ngena ngemvume njengomsebenzisi wempande (su – root) bese wenza i-crontab -l.
- Ukuze ubuke okufakiwe kwe-crontab kwabanye abasebenzisi be-Linux : Ngena ngemvume ukuze uqedele futhi usebenzise -u {username} -l.
Ingabe i-crontab isebenza njengempande?
2 Izimpendulo. Bona zonke zigijima njengempande . Uma udinga okunye, sebenzisa i-su kuskripthi noma wengeze okufakiwe kwe-crontab ku-crontab yomsebenzisi ( man crontab ) noma i-crontab ebanzi yohlelo (engingakwazi ukukutshela indawo yayo ku-CentOS).
Ngiyibona kanjani yonke i-crontab yabasebenzisi?
Ngaphansi kwe-Ubuntu noma i-debian, ungabuka i-crontab nge /var/spool/cron/crontabs/ bese kuba nefayela lomsebenzisi ngamunye phakathi. Lokho okwenzelwe ama-crontab aqondene nabasebenzisi kuphela kunjalo. Ku-Redhat 6/7 kanye ne-Centos, i-crontab ingaphansi /var/spool/cron/. Lokhu kuzobonisa konke okufakiwe kwe-crontab kubo bonke abasebenzisi.
Ngiyishintsha kanjani i-crontab ezenzakalelayo?
Okokuqala ngqa lapho ukhipha umyalo we-crontab ngo-e (hlela) inketho kutheminali ye-Bash, ucelwa ukuba ukhethe umhleli ongathanda ukusisebenzisa. Thayipha i-crontab , isikhala, -e bese ucindezela u-Enter. Umhleli owukhethayo ube esesetshenziswa ukuvula ithebula lakho le-cron.
Ngingaqala kanjani i-cron daemon?
Imiyalo yomsebenzisi we-RHEL/Fedora/CentOS/Scientific Linux
- Qala isevisi ye-cron. Ukuqala insiza ye-cron, sebenzisa: /etc/init.d/crond start. …
- Misa isevisi ye-cron. Ukumisa isevisi ye-cron, sebenzisa: /etc/init.d/crond stop. …
- Qala kabusha isevisi ye-cron. Ukuze uqale kabusha isevisi ye-cron, sebenzisa: /etc/init.d/crond restart.
Ngingabona kanjani ukuthi i-cron isebenzisa Ubuntu?
Ukuhlola ukubona ukuthi i-cron daemon iyasebenza yini, sesha izinqubo ezisebenzayo ngomyalo we-ps. Umyalo we-cron daemon uzovela kokuphumayo njenge-crond. Okufakiwe kulokhu okukhiphayo kwe-grep crond kunganakwa kodwa okunye okufakiwe kwe-crond kungabonwa kusebenza njengempande. Lokhu kubonisa ukuthi i-cron daemon iyasebenza.
Ngazi kanjani ukuthi umsebenzi we-cron uphumelele?
Indlela elula yokuqinisekisa ukuthi i-cron izamile ukusebenzisa umsebenzi ukumane hlola ifayela lokungena elifanele; amafayela welogi nokho angahluka kusuka kusistimu kuya ohlelweni. Ukuze sinqume ukuthi yiliphi ifayela lokungena eliqukethe izingodo ze-cron singamane sihlole ukuvela kwegama elithi cron kumafayela okungena ngaphakathi /var/log .
Ngibabona kanjani bonke abasebenzisi ku-Linux?
Ukuze ufake ohlwini abasebenzisi ku-Linux, kufanele khipha umyalo "wekati" kufayela elithi "/etc/passwd".. Lapho wenza lo myalo, uzokwethulwa ngohlu lwabasebenzisi olutholakalayo njengamanje ohlelweni lwakho. Kungenjalo, ungasebenzisa umyalo othi "okuncane" noma "okuningi" ukuze uzulazule phakathi kohlu lwegama lomsebenzisi.