Crontab scripts often fail to execute on schedule or as intended for various reasons. Common issues include incorrect notation in the crontab entry, which can lead to misinterpretation by the cron daemon. Permissions problems may also arise, where the script lacks the necessary executable rights, preventing it from running. Another factor is the environment in which the script operates; scripts executed by cron may not have the same environment variables as those run in a user shell. Identifying and addressing these specific issues can help ensure that crontab scripts function correctly and reliably.
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