If the yum command has been deleted from your Linux system, you can try to restore it by reinstalling the package that provides the yum command.
On Red Hat-based systems, such as Red Hat Enterprise Linux (RHEL) or CentOS, the yum command is provided by the yum package. To install the yum package and restore the yum command, you can use the following command:
sudo yum install yum
On Debian-based systems, such as Ubuntu, the yum command is not available. Instead, you can use the apt package manager to install and manage packages. To install a package on Ubuntu, you can use the apt-get command, like this:
sudo apt-get install package_name
Keep in mind that you need to use the correct package manager for your Linux distribution. Consult the documentation and online resources for more information on installing and managing packages on your specific Linux distribution.