telnet: command not found

`telnet` is a command line tool used to establish a connection to a remote computer. If you receive the error "telnet: command not found", it means that the `telnet` command-line tool is not installed on your system or it is not in the system's path.

To install `telnet` on your system, you can use the package manager specific to your operating system. For example, on Ubuntu or Debian, you can install `telnet` by running the following command:

sudo apt-get install telnet

On CentOS or Fedora, you can install `telnet` by running the following command:

sudo yum install telnet

On macOS, you can install `telnet` by installing the Xcode command line tools:

xcode-select --install

Once you have installed `telnet`, you should be able to use it to establish a connection to a remote computer.