Yum and its installation method cannot be found in the Centos7 system.

In CentOS 7 system,
yum is the default package management tool, used to install, update and manage software packages. If you cannot find the
yum command on a CentOS 7 system, it may be because its path is not configured correctly or the package has been deleted.

The following is how to reinstall
yum in CentOS 7 system:

1. Open the terminal by pressing
   Ctrl Alt T Shortcut keys to open the terminal.

2. Run the following command to install
   yum:

   sudo yum install yum

   This will use the CentOS default package management tool
   yum to install
   yum itself.

3. During the installation process, the system will prompt you to enter the administrator password. After entering the password, press the Enter key.
4. Confirm installation, enter
   YAnd press the Enter key and wait
   The download and installation process of yum is completed.

After the installation is complete, you should be able to use the
yum command to manage software packages in the CentOS 7 system.

If errors or problems occur during installation, please ensure that your system is connected to the Internet and try to update the system's package list before reinstalling
yum.

To sum up, if you cannot find the
yum command in CentOS 7 system, you can solve the problem by reinstalling
yum.

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