We have multiple commands which deal with sensitive information like passwords, system hardware on Linux. By preventing regular users from executing these commands helps to protect the system. In order to gain administrative access and gain some of the privileged commands you have to be logged in as a root user.
su OPTIONS USERNAME
su command allows you to temporarily act as a different user.
By default, if a user account is not specified, the
su command will open a new shell as the root user, which provides administrative privileges.
After executing the
su command a password is required.
As a security measure, the password will not be visible as it is typed, so you have have to type it correctly.
admin@localhost:~$ su - Password: root@localhost:~#
As you can see the has changed and reflected to
root@localhost switching from
admin@localhost:. This means you are now logged in as a root user.
To logout and return to admin account use
exit command, It will change back
root@localhost:~# exit logout admin@localhost:~$
To avoid executing any sensitive commands, we configure the Steam Locomotive command, the
sl command, to require administrative access. If the command is executed as admin in this case, it fails:
admin@localhost:~$ sl -bash: /usr/bin/sl: Permission denied
To execute the
sl command with administrative access use the
su to switch to the root account
admin@localhost:~$ su - Password: root@localhost:~# sl
sudo [options] commandThe
sudocommand allows a user to execute a command as another user without creating a new shell. Like the
sudocommand assumes by default the root user account should be used to execute commands.
sudocommand can be used to switch to other user accounts as well. To specify a different user account use the
sudo provides administrative access for the execution of the specified command. This is an advantage as it reduces the risk that a user accidentally executes a command as root.
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