Diagnosing a Cron Command That Works Manually but Not on Schedule Print

A command can work in an interactive shell but fail under cron because cron runs with a different environment and schedule.

1. Use absolute paths for the executable and script, as cPanel’s Cron Jobs documentation recommends.
2. Confirm the script has the permissions required to execute.
3. Check the cron timing fields and verify the intended timezone assumptions.
4. Temporarily allow cron output to be emailed or redirect output to a log file so errors are visible.
5. Do not schedule the job so frequently that a new instance starts before the previous run finishes.
6. Test the exact command copied from the cron entry rather than a shortened interactive version.

Environment variables, working directory, and command paths that exist in an interactive shell may not exist in cron.