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Automating a repetitive task like 'run this backup script every night at 3 a.m.' has relied on the same old Linux tool for decades.

'Run the backup script at 3 a.m. every day' — which venerable Linux scheduler has handled jobs like this for decades?

Q: 'Run the backup script at 3 a.m. every day' — which venerable Linux scheduler has handled jobs like this for decades?

cron. cron runs commands on a timetable (the crontab). Its five-field '* * * * *' syntax for minute, hour, day, month, and weekday has been automation's standard language for nearly half a century.

cron ✓
clock
alarm

cron
cron runs commands on a timetable (the crontab). Its five-field '* * * * *' syntax for minute, hour, day, month, and weekday has been automation's standard language for nearly half a century.

cron is a Linux utility that runs commands automatically according to a schedule you define in a file called the crontab, letting you set up tasks like running a backup script every night at a specific time without any manual intervention. Its scheduling syntax uses five fields representing minute, hour, day of month, month, and day of week, written compactly as something like '0 3 * * *' for 3 a.m. daily.

'clock' and 'alarm' are simply generic, non-technical words describing time-related concepts, but neither is an actual scheduling tool used in Linux systems.

cron's five-field syntax has remained essentially unchanged for decades, making it one of the longest-lived pieces of standard automation language in computing, still taught to programmers today exactly as it was originally designed.

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