11/20/2023 0 Comments Sudo vs su rootIn addition, most sh scripts can be run by Bash without modification. It offers functional improvements over sh for both programming and interactive use. It is intended to conform to the IEEE POSIX P1003.2/ISO 9945.2 Shell and Tools standard. Bash is an sh-compatible shell that incorporates useful features from the Korn shell (ksh) and C shell (csh). This command runs "bash" as a super user.īash is the shell, or command language interpreter. The sh utility is a command language interpreter that shall execute commands read from a command line string, the standard input, or a specified file. This is where sudo comes in - it allows authorized users (normally "Administrative" users) to run certain programs as Root without having to know the root password. However, since the Root account physically exists it is still possible to run programs with root-level privileges. This means that you cannot login as Root directly or use the su command to become the Root user. This command is used to login at root account.īy default, the Root account password is locked in Ubuntu. In some cases, this is necessarily Root, but most of the time it is a regular user. Ideally, you run as a user that has only the privileges needed for the task at hand. You could type a command incorrectly and destroy the system. The SuperUser can do anything and everything, and thus doing daily work as the SuperUser can be dangerous. Even though most every Linux distribution uses sudo, some of them (such as. This wouldn't have happened, if the admin invoked su - instead.In Linux (and Unix in general), there is a SuperUser named Root. Sudo stands for super user do and allows standard users to take admin-level actions, such as installing software. You maybe noticed that the corrupted $PATH variable was not reset. Why Because becoming root with su means that you are root, which is the same as logging into a terminal as the root user with root's password. rw-r-r- 1 root root 1093 13:02 /tmp/shadow_copy Becoming root permanently with su is a well-known 'no-no' in the nix universe. Wow! Thanks, super admin! $ ls -l /tmp/shadow_copy If your admin isn't that smart or just a bit lazy, he might come to your desk and try with his super-user powers: $ su Now, you ask your admin why you can't cat the dummy file in your home folder, it just won't work! $ ls -l /home/you/dummy_file Imagine, you're a software developer with normal user access to a machine and your ignorant admin just won't give you root access. If the superuser is named root, then su and su root are equivalent (and don't simulate directly logging in), as are su - and su - root (which do). su root switches to the user named root and doesn't simulate directly logging in. Su just switches the user, providing a normal shell with an environment nearly the same as with the old user. su - switches to the superuser and sets up the environment so that it looks like they logged in directly. A login shell resets most environment variables, providing a clean base. These options are documented under man sudo. Ever wondered what's the difference between su and sudo In this video, you'll learn all about the differences of the switch user(su) and. The -u user option means to run the command as the specified user rather than root. The -s option means to run the shell specified in the environment variable SHELL if this has been set, or else the users login shell. Possible Duplicate: Why do we use su - and not just su I understand that root doesn't have to be a superuser. sudo -su user is short for sudo -s -u user. Su - invokes a login shell after switching the user. What is the difference between 'su -' and 'su root' duplicate Ask Question Asked 12 years, 1 month ago Modified 12 years, 1 month ago Viewed 113k times 26 This question already has answers here : Closed 12 years ago.
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