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What are the differences between "su", "sudo -s", "sudo -i", "sudo su"?

Sun, 05 Apr 2026 12:01:00 GMT

sudo su Asks your password, becomes root momentarily to run su as root. sudo su - Asks your password, becomes root momentarily to run su - as root. So in this case you are running su using sudo and you don't have to know root's actual password. The results are same as su and su -.

Why do we use su - and not just su? - Unix & Linux Stack Exchange

Sat, 04 Apr 2026 10:22:00 GMT

The main difference is : su - username sets up the shell environment as if it were a clean login as the specified user, it access and use specified users environment variables, su username just starts a shell with current environment settings for the specified user. If username is not specified with su and su -, the root account is implied as default.

What's the difference between sudo su - and sudo su

Mon, 06 Apr 2026 00:40:00 GMT

29 When you provide a double-hyphen the experience you will have is identical to if you had just executed sudo su without any hyphen. Passing a single hyphen is identical to passing -l or --login. The man page for su describes the behavior as: Provide an environment similar to what the user would expect had the user logged in directly.

su vs sudo -s vs sudo -i vs sudo bash - Unix & Linux Stack Exchange

Fri, 03 Apr 2026 12:47:00 GMT

su is equivalent to sudo -i and simulates a login into the root account. Your working directory will be /root, and it will read root's .profile etc. The prompt will change from $ to #, indicating you have root access. sudo -s launches a shell as root, but doesn't change your working directory. sudo bash where bash is command to run with sudo.

What is the difference between 'su -' and 'su root'? [duplicate]

Thu, 02 Apr 2026 23:25:00 GMT

8 su - switches to the superuser and sets up the environment so that it looks like they logged in directly. su root switches to the user named root and doesn't simulate directly logging in. 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 - user Vs sudo su - user - Unix & Linux Stack Exchange

Mon, 30 Mar 2026 04:16:00 GMT

8 sudo su - will elevate any user (sudoer) with root privilege. su - anotheruser will switch to user environment of the target user, with target user privileges What does sudo su - username mean?

What is the difference between 'su -' , 'sudo bash' and 'sudo sh'?

Sun, 05 Apr 2026 21:20:00 GMT

su -: This will change your user identifier and inherit the environment variables as if you had logged in with that user. Normally you would use the format su - to login as the user . If you drop the "userid" it assumes you are trying to login as root - which you can't (unless you change the root password). sudo bash & sudo sh: Anything after the sudo is a program to run - so in these ...

'sudo su -' vs 'sudo -i' vs 'sudo /bin/bash' - when does it matter ...

Thu, 02 Apr 2026 14:21:00 GMT

sudo su - This time it is a login shell, so /etc/profile, .profile and .bashrc are executed and you will find yourself in root's home directory with root's environment. sudo -i It is nearly the same as sudo su - The -i (simulate initial login) option runs the shell specified by the password database entry of the target user as a login shell.

What's the difference between sudo su vs just su?

Wed, 01 Apr 2026 03:45:00 GMT

The su command can only prompt for the target user's password (assuming a default pam stack), while sudo can be configured to authenticate as the source or target user, or neither, or always root - and can do so per command.

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Fri, 03 Apr 2026 17:33:00 GMT

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