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Validate Unix and Linux crontab expressions. Test crontab syntax for system cron, see next execution times, and verify user vs system cron differences.
> Validation and explanation of cron schedules.
> Next runs, breakdown of each field.
Linux crontab uses the standard 5-field format plus a command: * * * * * /path/to/command. Key tips: use absolute paths for commands (cron doesn't inherit your shell PATH), redirect output to avoid email spam (>/dev/null 2>&1), and use crontab -l to list existing entries and crontab -e to edit. System cron (/etc/cron.d/) adds a 6th field for the user who runs the command.
Most common issues: 1) Script not executable (chmod +x). 2) Relative path instead of absolute path. 3) Environment variables not set (cron uses minimal environment). 4) Output not redirected (silent failures). Check /var/log/cron or /var/log/syslog for cron logs.
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