If you are seeing the error "-bash: sudo: command not found" when trying to run the sudo command on a Linux system, it means that the sudo command is not installed or not in the system's search path.
The sudo command allows you to run commands with superuser privileges. It is typically installed by default on most Linux distributions.
To fix the "command not found" error, you will need to install the sudo package. On a Debian-based system, such as Ubuntu, you can install sudo by running the following command:
sudo apt-get install sudo
This will install the sudo package and any necessary dependencies. Once the installation is complete, you should be able to use the sudo command without encountering the "command not found" error.
If the sudo package is already installed, but you are still seeing the "command not found" error, it may be because the sudo command is not in the system's search path. To fix this, you can add the directory that contains the sudo command to the PATH environment variable.
For example, if the sudo command is located in the /usr/bin directory, you can add this directory to the PATH variable by running the following command:
export PATH=$PATH:/usr/bin
This will add the /usr/bin directory to the PATH variable, which will allow the system to find the sudo command when you run it.