Why Does My Compiled C Program Show \'bash: ./program: Permission Denied\'?

Executable Permission Denied: Resolving "bash: ./program: Permission Denied"

When executing compiled C programs, users may encounter the error "bash: ./program: permission denied." This issue occurs due to a missing executable permission on the target program.

Understanding File Permissions

In Unix-like operating systems, each file has associated permissions that control access rights. The three main permissions are:

• Read: Allows reading the file's contents
• Write: Allows modifying or overwriting the file
• Execute: Allows running the file as a program

Resolving the Issue

To resolve the executable permission denied error, the following steps can be taken:

1. Assign Executable Permissions:

chmod u+x program_name

This command adds executable permissions for the user who owns the program to "./program_name." Replace "program_name" with the actual filename.

2. Copy File to Local Volume:

If the above command does not resolve the issue, it may be due to security controls on the mounted volume where the program is located. Copying the file to a local volume on the system, followed by assigning executable permissions to the copy, may solve the problem.

Additional Considerations

• External Mounting: When copying files from external devices or mounted volumes, executable permissions may be disabled as a safety measure.
• Volume Security Controls: Check volume security settings in the fstab file to ensure execute permissions are allowed. However, copying the file to a local volume is a more straightforward solution.

The above is the detailed content of Why Does My Compiled C Program Show \'bash: ./program: Permission Denied\'?. For more information, please follow other related articles on the PHP Chinese website!