The sudo command allows you to run any command as another user and is commonly used to elevate permissions so that the command is run as an administrator which in Linux terms is known as the root user. The way you switch to the root user differs by distribution. For example, on Ubuntu-based distributions such as Linux MintUbuntuKubuntu, Xubuntu, and Lubuntuswitch using the sudo command as follows:.

linux switch user without password

If you are using a distribution which allowed you to set a root password when you installed the distribution then you can simply use the following:. If you ran the command with sudo then you will be asked for the sudo password but if you ran the command just as su then you will need to enter the root password.

The whoami command tells you which user you are currently running as.

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The su command switch to any other user's account. This ability is useful when you're testing user-account provisioning. For example, assume you created a new user called ted using the useradd command.

Switch to the ted account using the following command:. As it stands, the above command would log you in as ted but you wouldn't be placed in the home folder for test and any settings that ted has added to the. This time when you log in as tedyou will be placed into the home directory for ted. To switch to another user's account but have a command run as soon as you switch, use the -c switch as follows:.

In the above command, the su switches user, the -c screenfetch runs the screenfetch utility and the - ted switches to the ted account. Linux Switching from Windows.

Tweet Share Email. Technically, su stands for substitute user.

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To confirm that you have indeed switched to the root user type the following command:. You can, however, log in as ted and adopt the environment using the following command:. More from Lifewire.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Super User is a question and answer site for computer enthusiasts and power users.

It only takes a minute to sign up. I'm a newbie running Ubuntu 9. I have two users wife and meand each user's screensaver is set to lock so that on wakeup, we get to choose which user's desktop to go to.

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However, Ubuntu requires a password, so this is pretty tedious. I'd like to switch users without entering any password.

I know about this trick that works for the boot login, but it doesn't deal with multiple users.

linux switch user without password

I'm expecting real Linux users to suggest that passwordless users must not get any rights and there be an admin user with a strong password. Yes, you're right. But that's not what this question is about. This is not the same as setting an empty password, or having GDM auto-login a given user; and it only works in GDM -- logging in on the text console, or via SSH, or using sudostill requires a password.

I've used this method before with success, under Ubuntu 9. If your users are all in some group say, group familyyou could give this capability to all family users with this line instead:. This works on the basic GDM login screen; I'm not sure if it will work with the coming-back-from-screensaver.

How to Become Root or Any Other User Using the Linux Command Line

Did you try link text. This is a little dangerous if you don't know how to handle the shadow password file, however, probably the simplest way to do what you want. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. How to switch users without entering password Ask Question. Asked 10 years, 1 month ago. Active 10 years, 1 month ago.

linux switch user without password

Viewed 6k times. Is it possible to set empty passwords for users in Ubuntu, or skip the password in other ways? Torben Gundtofte-Bruun.

A little outside the box here: you could have two automatic logins at once, each on their own independent display. The problem with the "no password" route, is that this makes your machine easy to break into, and all of us have to deal with the spam that is produced using poorly secured computers - half of the traffic on the internet is spam, most of it from people who don't even know they are running a spambot. It's a computer at my home, not at the library. What I want to achieve is to NOT have to enter the password when switching users.

If there's a better way, please provide it as an answer - much appreciated! I only have one physical monitor but gather from your comment that Linux has more meanings to this. The "wife acceptance factor" means that Ctrl-Alt-something is not an option.

Update: this issue produced a related question: superuser. Active Oldest Votes. Great answer!By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Ask Ubuntu is a question and answer site for Ubuntu users and developers. It only takes a minute to sign up. If I attempt to change my password to nothing by opening "User Accounts", the "Change" button remains greyed out:. How do I change my password to be empty? I know you can set Ubuntu to automatically log you in, but I want my password to be empty, I never want to type in a password to authenticate myself as that user.

I know that there are reasons why this might not be a good idea, but I want to know if it is even possible. I'm using Ubuntu Otherwise, sudo will ask for a password even when you don't have one, and won't accept an empty password.

To do so, open the sudoers configuration file with sudo visudoand add the following line to the file, replacing david with your username:. If you ever get prompted for a password, just type enter and it should work.

I've tested this answer with LightDM, the lock screen, sudogksu and it works, but there's one more step to get it to work with pkexec thanks muru. Warning: Be careful once you remove your password using this method, you won't be able to authenticate yourself to prove you have admin rights, in a GUI or in the terminal like installing an application using Synaptic, or using sudo through the command-line.

This is because of bug To give the user a password again after running this procedure, you can't use a GUI bugyou have to use the command-line:. Log in as another user with admin priveleges. Remember, the original one cannot run with admin privileges without a password using this method. Again, I must warn you that once you remove the password, you won't be able to authenticate yourself in the GUI or a terminal, like installing an application using Synaptic, or using sudo on the command-line.

I think it's possible to do this, but will get you into trouble once you try to install updates or anything else that requires sudo; as you need an account with sudo access and a password in order to install. Best solution to your question: Choose to automatically log in your account, which is likely the main benefit you're after. But, in the end you have to enter the system via the GUI and even if you did change the password to blank the GUI would prevent that.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Ask Ubuntu is a question and answer site for Ubuntu users and developers. It only takes a minute to sign up. There is another solution, using pam. Ubuntu Community Ask! Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered.

linux switch user without password

How can I switch user without password? Ask Question. Asked 8 years, 2 months ago. Active 7 years, 3 months ago. Viewed 9k times. How can I switch user without password in ubuntu server Jorge Castro Why do you want to do this?

Active Oldest Votes. I would seriously think before "logging in as some other user but myself". There are laws and privacy policies that normally forbid such behaviour without user's approval.

Please use good passwords.

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Good passwords take seconds of your time and give you tons of security layers. Avoid these solutions for servers that are connected to the Internet. Please make sure your user does not have an encrypted home or encrypted private directories. The user can lose their data if they don't know their old password. Solution 1 sudo passwd myotheruser Use "x" as password.

Then login as myotheruser with password "x": sudo login myotheruser Solution 2 There is another solution, using pam. Savvas Radevic Savvas Radevic 6, 2 2 gold badges 33 33 silver badges 44 44 bronze badges.

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It is probably worth noting that you shouldn't ever use a password change method that doesn't request the old password if you're also making use of encrypted home or private folders.

When both passwords are provided, the filesystem key can be re-encrypted seemlessly.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. How can I do the same in a shell script without having to worry about the password? I tried the sudoers file method where I put:.

I did this and when I do su hduser or su - hduserit prompts me for the password again. What do I do? You don't use "su" with the sudoers file, you need to use "sudo". So, you'd want a command line like:. A line like this:. Learn more. How to make passwordless switch to another user in a shell script Ask Question. Asked 6 years, 4 months ago. Active 6 years, 4 months ago. Viewed 17k times. I want to su from hadoopmaster to hduser.

When I do it on the terminal, I do: su - hduser which then asks me for the password and I enter it and I get in to hduser. Active Oldest Votes. So, you'd want a command line like: sudo su - hduser which would do want you want, provided you had the appropriate lines in the sudoers file.

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Jim Nutt Jim Nutt 1, 10 10 silver badges 9 9 bronze badges. I'll try it out. I've found a bit easier way to do this.Today's Posts.

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Show Posts. Shell Programming and Scripting. Top Forums Shell Programming and Scripting switch as another user without password. Registered User. Join Date: Jan I want to switch as another user without using password. Is it posiible? I have one server B and I have logged in as username u1 but I want to login to that same server using username as u2 but I don't want to give the password for u2. Moderator Emeritus. Join Date: Feb What OS - there ae commands like pfexec, sudo, su that can do that for you.

Join Date: Sep If sudo is installed, you could sudo su - u2. These can only be edited by root though. Join Date: Nov Some random thoughtsBy using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Ask Different is a question and answer site for power users of Apple hardware and software. It only takes a minute to sign up. I want to be able to 'su' to a specific user, allowing me to run any command without a password being entered.

To configure sudo, you must edit its configuration file via: visudo. You usually need super user privilege for visudo :.

This file is structured in different section, the aliases, then defaults and finally at the end you have the rules. This is where you need to add the new line. So you navigate at the end of the file and add this:. I have just seen your comment regarding Skype. You could consider adding Skype directly to the sudo's configuration file.

I assume you have Skype installed in your Applications folder:. It also might work well enough for your needs and you'd not need an iPod touch to run your second Skype instance. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Asked 7 years, 2 months ago. Active 1 year, 4 months ago. Viewed k times. For example: If my login were user1 and the user I want to 'su' to is user2: I would use the command: su - user2 but then it prompts me with Password:.

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Ask the other user for the password. This is nothing to do with another physical user. Both ID's are mine.

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I know the password as I created the account. I just don't want to have to type the password every time. Would it be ok to ssh to at user or do you need to inherit one shell in particular and need su to work? Does open -na Skype not work for you? You could also try copying the application bundle and changing CFBundleIdentifier. Active Oldest Votes. Configuration To configure sudo, you must edit its configuration file via: visudo. You usually need super user privilege for visudo : sudo visudo This file is structured in different section, the aliases, then defaults and finally at the end you have the rules.

Huygens Huygens 1, 1 1 gold badge 11 11 silver badges 18 18 bronze badges. This is far less complicated than the ssh keys idea, so use this unless you need the ssh keys for remote access as well. One thing to note from a security-perspective is that specifying a specific command implies that it should be a read-only command for user1; Otherwise, they can overwrite the command with something else and run that as user2.

And if you don't care about that, then you might as well specify that user1 can run any command as user2 and therefore have a simpler sudo config.

StanKurdziel good point! Although it is something to be aware of, it's really seldom to have system executables writable by users unless you're root but in this case you don't need sudo ;- But you're right to add this comment because it's so seldom that I've probably overlooked it more than one time.


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