su is a utility to run a shell or other command as another user (root by default).

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Difference between su and su - [duplicate]

I wonder what's the exact difference between these 2 commands:1. su 2. su - . Can anyone please explain?
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1answer
36 views

X11 forwarding via SSH and su

For me, it is weird that while using ssh connection with X11 forwarding, a user and root are able to see xclock, but another user is not able to see that. Why? mahmood@cluster:~$ xclock ^C ...
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1answer
23 views

Cannot switch to a non-admin user

Seems like I can't su unless the user is admin. When trying to ssh into the user or su username i get: Cannot execute /bin/bash: Permission denied Have tried almost every solution I could find on ...
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0answers
18 views

su permision denied from terminal Arch linux [duplicate]

When I try to become super user (root) from terminal I receive permission denied, but when I try from tty console (press ctrl + alt + F2) I have access to root. My question is how can I receive ...
5
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2answers
256 views

How is the su command masking/protecting my password from being displayed on screen? [duplicate]

Apologies if this is an abstract question - I'll try to be as specific as possible. When I'm at the bash shell and switch to a different account via su - foo, I'm prompted for a password. The ...
0
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1answer
65 views

Allow multiple users to “su” to multiple other users without password

This is similar to this question: Allow user1 to "su - user2" without password However, the solution only work for multiple users accessing "su"ing ONE user. #works fine :) 2 or more ...
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2answers
58 views

Why does util-linux runuser (su) fork?

Using runuser from util-linux (a different entry point for su, which only operates if starting from root), one sees a process tree that looks something like the following: [root] runuser -u username ...
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1answer
32 views

command line in su - and background

I am writing a simple unix script to automate reading of a log file. The following does not give any output to the terminal. It just asks for the password for buser and then it just hangs. I ...
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0answers
35 views

Switching (su) to a paswordless account

I've made account A passwordless with passwd -d A. Now, when I log in as user B from a terminal and run su A I can switch to user A (and I am not even asked for a password). If, however, I log as ...
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2answers
76 views

How to use cd command in su command?

In the below script the cases aserver and bserver work fine. But in case "cserver" above, after su - gsxuserp, I need to perform the following three options with the same user. cd .. cd ...
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84 views

Unable to su to any user as root on Red Hat 6.7 server

System: Red Hat Enterprise Linux Server release 6.7 (Santiago) I am trying to su to kms user(OS user) as root but i keep getting error saying You are required to change your LDAP password ...
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2answers
80 views

Can't get user $HOME over su on Solaris and AIX

I'm trying to get user $HOME variable over su. Solaris # su oracle $ echo $HOME /root AIX # su oracle $ echo $HOME / Linux # su oracle $ echo $HOME /home/oracle Can someone explain why on ...
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3answers
148 views

What exactly differentiates the root user from every other user?

What are the fundamental differences between some arbitrary account and root? Is it just the UID being something other than zero? So, what exactly does the su binary do and how does it elevate a user ...
1
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1answer
56 views

X11 authentication is not working in `sudo sux / sudo su`, but works in `sux / su.` Why?

I have a vnc session and I can access X11 just by doing su - user, for other user, without the need of sux. Also, when I am trying to switch to user, using sudo sux - user or sudo su - user, I can't ...
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0answers
60 views

debian 8 cinnamon file manager ssh as super-user

On a linux remote server I've a user who can become super-user without typing the password, e.g. simply typing sudo -s. Using winscp on windows there is an option to pass the sudo command (sudo su ...
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0answers
35 views

Run mkvirtualenv command as another user

I want to run the "mkvirtual sth" but I have to run the script as superuser. sudo ./install.sh install.sh looks like this: # ... mkvirtualenv sth # su - geeret -c "mkvirtualenv sth" # (tried ...
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2answers
75 views

How are setuid, suid, sudo, and su all related? [duplicate]

I have a feeling the setuid bit, the nosuid mount option, sudo, and su are all related given their names. But how do they relate to one another? Are some of them used in conjunction? If they are not, ...
3
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1answer
83 views

root cannot connect to symlinked socket of other user

I use oh-my-zsh's ssh-agent plugin to have a static symlink to my current SSH_AUTH_SOCK created. When connecting through SSH with agent forwarding enabled the file /tmp/ssh-agent-$USER-screen is ...
0
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1answer
20 views

X Forwarding over SSH when switching users [duplicate]

How do I forward X when switching users? I can ssh -X username@server.example.com and open GUIs just fine. However, then when I sudo su to root, the X11 forwarding seems to stop because the windows ...
1
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1answer
20 views

How (or is it possible) the Linux desktop X-Server from Terminal under an SU otherusername

I have a simple scenario to demonstrate the use-case for this question Login to Linux as currentuser start bash terminal xauth list $DISPLAY mint/unix:0 MIT-MAGIC-COOKIE-1 ...
0
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1answer
85 views

What's different between “su - username” then command and “sudo -u username command”

I have a problem about unixodbc. It show the error message about Can't open lib .... So, I use the ldd command to check. If I use su - username,the result like below: [root@ostest ~]# su - mysql ...
2
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1answer
82 views

When can a user do `sudo su` but not `sudo su -`?

The following happened to me: $ sudo su - superman Sorry, user clarkkent is not allowed to execute '/bin/su - superman' as root in krypton101. However the following worked fine: $ sudo su ...
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0answers
255 views

sudo and su hang indefinitely… stumped

I am trying to run su or sudo on my CentOS 6.6 machine. Every time I try to execute either command, I get prompted for a password. After entering the password, the command simply hangs. I can ctrl+c ...
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0answers
33 views

What command should I use to explicitly set list of groups and execute a command?

To execute a command as other uid, one uses su. The list of supplementary groups is not specified on command line, but instead read from configuration files (/etc/passwd, /etc/group), etc. Which tool ...
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2answers
141 views

Fedora 23 password only showing 5 characters. Issues using su command

Today I installed Fedora 23, and once I finished I had no problems the SU command. I rebooted my VM and logged in, and it wont let me use the SU command. When I enter it, it asks for my password. So I ...
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1answer
157 views

want to su without password inside shell script

I have written a script which will run a script for a backup before: # cat backup-before-shutdown #Scritp to take backup before shutdown #Author Ashish Karpe echo "Taking backup to s3" su ubuntu ...
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126 views

Slow script execution

I have a strange problem... My script: #!/bin/bash SECONDS=0 lock_file=/tmp/$0.lock [ -e $lock_file ] && exit touch $lock_file echo "<<<db2_hadr_check>>>" instances=( ...
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0answers
51 views

Linux/CentOS - can't su after changing ownership

I mistakenly changed ownership of all files on a CentOS system from root to my login account. I can login but if I su I get: su: cannot set groups: Operation not permitted I don't need the system ...
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2answers
129 views

How do I fix my /etc/sudoers file to recognise me?

Currently, I am receiving the following terminal error: sudo: parse error in /etc/sudoers near line 10 sudo: no valid sudoers sources found, quitting sudo: unable to initialize policy plugin I have ...
0
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1answer
196 views

Valid root/user passwords not working on EC2

There is an authentication failure when I'm trying to enter password for any of my accounts after an update using yum. My authentication got broken, while everything else works. The updates were ...
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0answers
53 views

Why use use su -c to start background processes?

After reading Link im under the impression that using su -c with & would be redundant. My reasoning is that any process started with su -c will be started in a new shell but it will not be killed ...
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1answer
81 views

Differences between `su` and `su-to-root`?

There are other questions on this forums about the usage of su, su -, su root... etc. But I have found none about the su-to-root command, and I would like to understand the basics of its usage. ...
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1answer
37 views

Make superuser act like some other user in certain directory tree

I have the following problem: My home directory lies on the network and is mounted locally on home/<my username>. I can access it with my normal user account <my username>, but as root, I ...
0
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1answer
99 views

What's wrong with exit command on my terminal?

I'm using Linux Mint 17.2 Cinnamon, and I'm a beginner, just switched over from Win10. Somehow, the exit command isn't working, could somebody help me out?
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2answers
1k views

`su` command: Permission denied

When I type into bash the following command su -s /bin/bash as root, then no error occurs. When I type su -s /bin/bash -m [MyUserName], then I get the error: Permission denied. As far as I could ...
0
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1answer
89 views

Is it possible to execute a command as another user without sudo su'ing to that user?

I do a lot of administration in CentOS6 for several teams. One of the more frequent things I do is sync down and package code as the team account, before deploying it out under my own account. Is ...
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0answers
34 views

Slackware su man pages does not mention /etc/suauth, what reason?

I've been reading the man pages before I start restricting su access to certain users (I'd like to not rely on sudo if possible). There is no /etc/suauth file so I was going to create my own and ...
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4answers
137 views

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

I see a lot of posts out there that say you type in sudo su to get an interactive prompt with root privileges, and I see equally many posts debating the pros and cons over sudo -i vs sudo su. Here ...
0
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1answer
154 views

ssh master - execute su remotely

I have a server S that I need to connect to. I'm connecting to S as user asdf with control master and after that I perform some stuff: ssh -N -f -M -o ControlPath=$SSHSOCKET ${USER}@${IP} -p ${PORT} ...
1
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1answer
138 views

Bash script with (X)dialog asking for root password (kdesu substitute)

I'm using (X)dialog for a script that a normal runs, but it needs root privileges for some commands. The script runs from a .desktop file, thus the user sees no terminal. For example here #!/bin/bash ...
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2answers
297 views

When in debian 8.1 why is the super user run with su not sudo? [closed]

I am curious why the super user command su is run and not super user do (sudo).
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0answers
265 views

Difference between 'xhost + ' and 'xhost +SI:localuser:AnotherUser'

If I do xhost + >access control disabled, clients can connect from any host su AnotherUser -c xterm an xterm popups, but if I do xhost +SI:localuser:AnotherUser >localuser:AnotherUser being ...
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2answers
344 views

run command with sudo su in script and redirect stdin and stdout

I need to run command as another user and write to its stdin and read from its stdout. I can run command as another user only via opening new shell: sudo su anotheruser but with new opened shell i ...
3
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2answers
125 views

Why does man page completion fail after su?

I have a default Debian 8.1 installation. I do su man apt<TAB> but get nothing. I do see the manual when I write man apt-get in both modes: as user mas and as root. However, tab ...
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4answers
4k views

Is there ever a good reason to run sudo su?

To launch a root shell on machines where the root account is disabled, you can run one of: sudo -i : run an interactive login shell (reads /root/.bashrc and /root/.profile) sudo -s : run a non-login ...
3
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1answer
575 views

Possible to pipe command using su via ssh

I'm trying to write a python script to remotely update the login passwords for a set of account I administer - I can already successfully use python to pipe remote commands via the stdin of an ssh ...
0
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1answer
78 views

Set root password AMI linux

I need to set a password for root on EC2 AMI Linux. I have tried with passwd root but if I log in with ec2-user and run sudo su, I get a root bash without asking for a password.
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1answer
36 views

Disabling su - <user1> alone

In my Team , we have a server which few people know the root password I can see they log into root and then use su - user1 to use from user1 login., I cannot change root password for some reasons , ...
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2answers
458 views

sudo / su to user in a specific group

I am looking to setup a generic user that has the ability to su/sudo to any user in a specific group. Either that or to any user that has a specific naming scheme. Is this possible on linux? I ...
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3answers
170 views

switch to sudo user with AND command doesnt work

I am trying to copy the ssh private key from one user to another user in single shot. sudo su && cp /home/sk/keys/master.pem /home/sg-user/keys/ This command works well, when i run them one ...