Why Does My C Program Show \'bash: ./program: Permission Denied\' and How Can I Fix It?

Running Program Encounters "bash: ./program: Permission Denied" Issue

When executing a C program compiled on computer 1 on a different computer (computer 2), users may encounter the error "bash: ./program_name: permission denied." This issue arises due to missing execute permissions on the program file.

Solution:

To resolve this issue, the following steps can be taken:

1. Grant Execute Permission:
   Run the command chmod u x program_name on computer 2. This action grants execute permission for the user who owns the program file.
2. Copy and Execute from Local Volume:
   If the previous step does not resolve the issue, copy the program from the USB device to a local volume on computer 2. Then, run chmod u x program_name on the local copy and execute it.

Explanation:

Unix-based systems typically require execute permissions to be set for programs to run properly. When files are transferred between systems or mounted from external devices, execute permissions may be lost due to security measures. Using the chmod command allows you to manually add execute permission to the file.

Additionally, some volumes may have security settings that prohibit execute permissions. In such cases, remounting the volume with appropriate options or copying the file to a local volume can bypass these restrictions. However, copying to a local volume is generally a simpler and more straightforward solution.

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