Linux - crontab
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RHEL8
cat /etc/crontab SHELL=/bin/bash PATH=/sbin:/bin:/usr/sbin:/usr/bin MAILTO=root # For details see man 4 crontabs # Example of job definition: # .---------------- minute (0 - 59) # | .------------- hour (0 - 23) # | | .---------- day of month (1 - 31) # | | | .------- month (1 - 12) OR jan,feb,mar,apr ... # | | | | .---- day of week (0 - 6) (Sunday=0 or 7) OR sun,mon,tue,wed,thu,fri,sat # | | | | | # * * * * * user-name command to be executed
- Cron's locations
/var/spool/cron is where the individual user crontabs live. As user, crontab -e edits the corresponding file in /var/spool/cron.
/etc/cron.d is a directory that is scanned for modular crontab files. The syntax is slightly different for files in that directory. The cron entries have an additional field for a user to run the cron entries as. This is the same as a systemwide /etc/crontab file.
Adding that the files in /etc/cron.d/ are, in effect, all root-owned (and therefore not user cron files); also, these files are NOT run by cron - they are run by a cron job that looks at these files.