Content in imx93 timer is not executed.

[xiang_1001]

bsp：real-time-edge-3.1.0.xml

The /etc/net-debug.sh file is executed regularly in /etc/crontab, but now this script doesn't run. What is the reason?

[Bio_TICFSL · Accepted solution]

Hello,

Common Reasons for a Failed Cron Job

• Permissions: The script lacks execute permissions. You need to make the script executable using chmod +x /path/to/your/script.sh.
• Path Environment Variable: Cron runs scripts in a minimal environment with a restricted PATH. Commands within the script may not be found.

• Missing or Incorrect Paths:
  • The crontab entry itself might use relative paths, which is problematic for cron.
  • The script might not specify the full path to commands it calls (e.g., instead of ls, use /bin/ls).

• Crontab Syntax Errors:
  • There must be a newline character after the last command in the crontab file.
  • The user field is missing in the /etc/crontab file, which requires a user name before the command.

•   Issues:
  • The script may rely on environment variables that are not set in the minimal cron environment.
  • Scripts containing non-text characters can cause failures

Troubleshooting Steps

1. Log Script Output: Redirect the script's output to a log file to see any error messages.
   bash

• * * * * * /path/to/your/script.sh >> /var/log/your_script.log 2>&1
  

• Check Permissions: Use ls -l /path/to/your/script.sh to verify the script has execute (x) permissions. If not, run chmod +x /path/to/your/script.sh.
• Use Full Paths: In your script, replace relative path commands with their full paths (e.g., /bin/grep instead of grep).
• Set Environment Variables: Add PATH and other necessary variables at the top of your cron entry or script to define the environment.
• Check for Newline: Open /etc/crontab and ensure there is a new line character after the last command in your entry.
• Verify User Field: For /etc/crontab, ensure the user field is present (e.g., root).
• Use cron.d: For root-owned jobs, consider placing them in /etc/cron.d/ instead of directly editing /etc/crontab for better organization

Regards

[xiang_1001]

I can use the timing function by putting the crontab file into the /etc/cron.d/ file.