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Crontab.guru - The cron schedule expression editor
The crontab file contains instructions for the cron daemon in a simplified manner. It allows users to define their own crontab, and environment variables can be set to specific time zones and security contexts. The format of a cron command is similar to the V7 standard, with a number of upward-compatible extensions.
crontab(5) - Linux manual page
Crontab (CRON TABle) is a file which contains the schedule of cron entries to be run and at specified times. File location varies by operating systems, See Crontab file location at the end of this document.
Cron job or cron schedule is a specific set of execution instructions specifying day, time and command to execute.
Crontab – Quick Reference
The cron and at services enable sysadmins to schedule tasks to run at a specific time in the future. The at service specifies a one-time task that runs at a certain time. The cron service can schedule tasks on a repetitive basis, such as daily, weekly, or monthly.
How I use cron in Linux | Opensource.com
Crontabs are tables that contain instructions to the (8) daemon of the general form: "run this command at this time on this date". The format of a cron command is very much the V7 standard, with a number of upward-compatible extensions. The crontab file contains environment settings, commands, and environment variables, and can be used to schedule jobs and schedule jobs for specific times.
crontab.org - CRONTAB(5)
3.3.2 Crontab files A crontab file contains instructions to the cron daemon of the general form: “run this command at this time on this date”. Each user ...
Crontab file (mcron 1.1.1)
The cron command-line utility is a job scheduler on Unix-like operating systems. Users who set up and maintain software environments use cron to schedule jobs (commands or shell scripts), also known as cron jobs, to run periodically at fixed times, dates, or intervals. It typically automates system maintenance or administration—though its general-purpose nature makes it useful for things like downloading files from the Internet and downloading email at regular intervals.
cron - Wikipedia
Linux crontab command help and information with crontab examples, syntax, related commands, and how to use the crontab command from the command line.
Linux Crontab Command Help and Examples