Why Does My Ubuntu System Return \'bash: ./program Permission Denied\'?

Ubuntu Execution Error: "bash: ./program Permission Denied"

When attempting to execute a compiled C program on Ubuntu using the "./program_name" command, you may encounter the "bash: ./program_name: permission denied" error on certain computers. This issue highlights a lack of execute permissions, which prevents the program from running.

To rectify this, the following steps are recommended:

1. Grant Execute Permissions: Use the "chmod u x program_name" command to assign execute permissions to the program file for the current user ("u").
2. Check File Copied Native: Ensure that the program file was copied natively onto the system, as copying via a USB device or mounting external volumes may have inadvertently removed execute permissions.

Unix-like systems implement security measures that require files to possess explicit execute permissions. By granting these permissions and ensuring the program resides on a compatible volume, you can successfully execute your C program on different Ubuntu computers.

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