Switch users and configure sudo access

In Linux, you can switch user and configure sudo access in a few simple steps. Here’s how you can do it:

Switching User

To switch user in Linux, you can use the su command. This command allows you to switch to another user account by entering the password of that account.

Open your terminal and type su - followed by the name of the user you want to switch to. For example, if you want to switch to the user “happyfeet”, you would type:

su - happyfeet

This will prompt you to enter the password for the user account you’re switching to. Once you’ve entered the password, you’ll be logged in as that user.

When switching to another user account on a Linux system, it’s generally better to use su - instead of just su. The - option tells the system to execute the user’s login shell, which sets up the user’s environment as if they had logged in directly. This ensures that the user has the correct environment variables, PATH settings, and so on.

If you want to switch to the root user account, you can simply enter su - without specifying a username:

su -

You may need to add sudo before those commands. This is why we will talk about the sudo access

Sudo access

Sudo is a program that allows you to run commands with the security privileges of another user (usually the root user) on a Linux system. By default, not all users on a Linux system have sudo access. To grant sudo access to a user, you need to add them to the sudoers file.

The sudoers file is located at /etc/sudoers. However, you should never edit this file directly. Instead, you should use the visudo command, which will check the syntax of your changes before saving them to the sudoers file.

To add a user to the sudoers file, you can add a line like this:

username ALL=(ALL) ALL

Replace username with the username of the user you want to grant sudo access to. This line allows the user to run any command with sudo.

If you want to restrict the user’s sudo access to specific commands, you can specify those commands instead of using the ALL keyword. For example:

username ALL=/usr/bin/apt-get

This line allows the user to run the apt-get command with sudo, but no other commands

Configuring Sudo access

The sudoers file allows for fine-grained control over who has access to sudo, what commands they can run with sudo, and under what circumstances. Here are some examples of how you can configure sudo access:

1. Restricting access

To restrict sudo access to specific users, you can add a line like this:

%sudo happyfeet, skipperfeet

This line allows only the users happyfeet and skipperfeet to run commands with sudo.

2. Granting passwordless sudo access

To grant passwordless sudo access to a user, you can add a line like this:

username ALL=(ALL) NOPASSWD:ALL

Replace username with the username of the user you want to grant passwordless sudo access to. This line allows the user to run any command with sudo without entering a password.

3. Setting time limits to sudo access

You can also set time limits on sudo access using the timestamp_timeout option. For example, to allow users to run commands with sudo without entering a password for 15 minutes, you can add a line like this:

Defaults    timestamp_timeout=15

This line sets the timestamp_timeout option to 15 minutes.