If your scheduled cron job isn't executing as expected, several factors could be preventing it from running. Cron is a time-based job scheduler in Unix-like systems, but misconfigurations are common.

First, check the cron syntax. The format consists of five time fields followed by the command:

• * * * * * command-to-execute
• Minute (0-59), Hour (0-23), Day of month (1-31), Month (1-12), Day of week (0-7)

A single asterisk means "every," while specific numbers or ranges define exact times.

Verify the command path. Cron runs with a minimal environment, so always use absolute paths for executables and files. For example, use /usr/bin/php instead of just php.

Check file permissions. The script being called must be executable (chmod +x script.sh). Also, ensure the cron table file has correct permissions.

Review cron logs. System logs often provide error details. On many systems, check /var/log/syslog or /var/log/cron for cron-related messages.

Environment variables matter. Cron doesn't load your shell profile. Set necessary variables directly in the cron job or within your script.

Finally, test manually. Run the command directly from the terminal to ensure it works outside of cron. If it fails, the issue is with the command itself, not the cron configuration.