ioctl: command not found

`ioctl` is a system call for input/output operations. It is usually used to control hardware devices or other system resources. If you are seeing the error message "ioctl: command not found", it means that the `ioctl` command is not installed on your system or it is not in your system's PATH environment variable.

To install `ioctl`, you need to find the package manager for your operating system and run the appropriate command. For example, on Ubuntu or Debian-based systems, you can install `ioctl` with the following command:

sudo apt-get install ioctl

If you are using a different operating system, you may need to use a different package manager or download and install `ioctl` manually.