Anything related with user accounts and user management on Unix-like systems.

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73
votes
4answers
271k views

How to switch between users on one terminal?

I'd like to log in as a different user without logging out of the current one (on the same terminal). How do I do that?
9
votes
5answers
14k views

Can a linux user change their password without knowing the current password?

I'm setting up a few ubuntu boxes, and using opscode's chef as a configuration tool. It would be fairly easy to install public keys for each user on each of these servers, and disable password ...
6
votes
2answers
891 views

How to mass change password attributes in AIX uname -rv=3 5 for all users but root

I want to do a mass change on all users but root in AIX for the following "password attributes": Weeks before password reuse: 15 Password min length: 6 Can it be done, or do I need to do them one ...
3
votes
2answers
163 views

How can I detect a user login programmatically? [duplicate]

I am developing a small daemon program which needs to run some instructions when a user logs onto the system (all kinds of logins included). In order to do so, I want my program to be woken up ...
1
vote
2answers
48 views

Remove group ID from user

How can I remove a group (which was previously deleted) from a user which still references it? If I run groups, I get an error about a non-existent group: $ groups myuser dialout cdrom sudo dip ...
0
votes
1answer
60 views

What has priority - owner/user vs group permission? [duplicate]

I have just run into the case in which the owner-group of a file has more permissions than the owner-user of a file. user1@pc:/tmp$ ls testfile -l ----rw---- 1 user1 user1 9 Okt 16 13:16 testfile ...
4
votes
2answers
169 views

Precedence of user and group owner in file permissions

I just ran into something unexpected (for me) regarding file permissions on Linux (Arch Linux). Basically I have: userX in groupX fileX userX:groupX ---rwx---- What puzzles me: I cannot perform ...
32
votes
7answers
21k views

How do you kick a benign user off your system?

I was googling this a bit ago and noticed a couple of ways, but I'm guessing that google doesn't know all. So how do you kick users off your Linux box? also how do you go about seeing they are logged ...
1
vote
1answer
202 views

Disable operations outside user's home directory with chroot jail?

I'm trying to restrict a user to a specific directory called gclegal using a chroot jail. I've uncommented the line in the /etc/vsftpd.conf file chroot_local_user=YES Created a new user called kg: ...
2
votes
2answers
32 views

How to add user info when creating a user?

If I create user khadija with username: khadija, how can I populate the fifth field of /etc/passwd? mysql:x:27:27:MySQL Server:/var/lib/mysql:/bin/bash I have not found anything under the useradd ...
0
votes
1answer
137 views

Grant FTP access to specific directory

I have setup CentOS on a box on my local network and installed httpd, PHP, Webmin (and UserMin) etc. I opted for ProFTPd and have opened up ports for FTP, Webmin and Apache. I can now access Webmin ...
4
votes
1answer
73 views

How can I start a 'screen' session as non-root user

Is there a way I can open a new 'screen' session on my RHEL box as a non-root user? When I try to open a new screen using the 'screen' command as a non-root user, it fails and I get the following ...
2
votes
1answer
383 views

Expired password and SSH key based login with UsePAM yes

There is a SLES 11 machine. The users logs in via SSH and pubkey (mixed, some user uses password, some use ssh key) The sshd_config has: UsePAM yes PasswordAuthentication yes PubkeyAuthentication ...
18
votes
11answers
4k views

How to create strong passwords in Linux?

I wonder how I can create strong passwords on Linux (for both normal and admin users) and if there are specific programs to do that.
1
vote
5answers
2k views

Is there some default password for a new user in Linux

I am a Windows user gradually moving towards Linux. In windows we have an option of either having or not having some password for an user.Once we do not put a password we can directly log in to the ...
0
votes
2answers
46 views

how to get info about the user and the processes he is running in systemd?

If I wanted to know who is logged in since when and what are the processes currently running under his control, how can I do that in systemd?
2
votes
1answer
39 views

w command for the other network hosts

While the who command refers to the local machine, rwho shows the same informations about all the known hosts of the local network. Similarly, w shows informations about the users on the local ...
2
votes
3answers
646 views

What mechanism prevents any user from accessing any other user's files via root?

On a multi-user system, what protects against any user accessing any other users files via root? As context, the question is based on my understanding as follows: There are two commands related to ...
0
votes
3answers
165 views

Is there a Linux equivalent of the Windows super-administrator?

Windows has a super-administrator account that has not only elevated privileges to perform protected system functions, but unfettered access to anything on the computer, regardless of user ownership. ...
4
votes
3answers
164 views

Restrict user access in linux

I'm creating a new user with the following details: useradd -d /var/www/html/testuser.com -G users testuser I proceed by creating a new password for the user and attempt to login via SSH, I land on ...
1
vote
1answer
409 views

Adding Windows user to Linux group; possible? [closed]

I have a NAS that runs on Linux and I connect to it from my Windows desktop. I noticed that all directory in that drive belongs to user 'root' and group 'root'. That effectively denies me the right to ...
-1
votes
6answers
522 views

How to change to normal user in the command line when logged in as the root user?

I log into an system through root via ssh. How do I become the normal user or another user on the system?
3
votes
3answers
53 views

Understanding a couple of points regarding root privileges

I just wanted to confirm my understanding of a couple of things related to root privileges. Is it correct that: The user name "administrator" is not a reserved name with implied privileges, it is ...
0
votes
1answer
50 views

How to create user in Linux without attributes in default group?

I know, how create with attributes adduser -n username GROUP, we find in /etc/default/useradd. But in login.defs, we can add something.
12
votes
4answers
7k views

How to check if a user can access a given file?

*nix user permissions are really simple, but things can get messy when you have to take in account all the parent directory access before reaching a given file. How can I check if the user has enough ...
1
vote
1answer
69 views

Securing www directory in Ubuntu/Apache without restricting access to those who need it?

I'm on my first time setting up an Apache2/Ubuntu web server and I'm stuck as to how to achieve the security settings I need. On the www folder - the web root - my www-data group (the apache and PHP ...
2
votes
2answers
53 views

What is the regex to validate Linux users?

When adding a new user, how is the string validated? I suppose there is a regular expression. What is that regular expression?
0
votes
0answers
75 views

can't find my user name in /etc/passwd nor name of my initial group in /etc/group

Here is what i get: [zehu@danville ~]$ groups apl vboxusers [zehu@danville ~]$ [zehu@danville ~]$ grep zehu /etc/passwd [zehu@danville ~]$ [zehu@danville ~]$ grep apl /etc/group [zehu@danville ...
0
votes
1answer
170 views

Create guest account with restricted access to applications

I'm trying to create a guest account in arch linux that only allows the user to use simple applications like firefox. I do not want them to have access to programs like terminal or grub-customizer ...
5
votes
2answers
252 views

Reasons behind the default groups and users on Linux

Having a look at the default users & groups management on some usual Linux distributions (respectively ArchLinux and Debian), I'm wondering two things about it and about the consequences of ...
1
vote
1answer
37 views

How to use programs by users who haven't installed them themselves?

I have created a new user on my Ubuntu Linux at which I am the root. My root account has access to Wine, I want to use Wine from my newly created account without having to install it again. I have ...
0
votes
0answers
167 views

PHP running under “www-data” user

In PHP if I run get_curret_user() it prints www-data. This makes it impossible for me to use this function in order to test a FTP password from input. Is there any way to make PHP run under the ...
7
votes
3answers
2k views

Once sudo su'd to root, is there a command to see my username?

I have sudo rights on a redhat box; once I've sudo su - to become root in a shell, are there any commands I can run to see what username I su'd FROM?
1
vote
0answers
242 views

Mount cifs using a credentials file

I am trying to mount a folder from my embedded Linux system to a windows 7 computer. I keep getting Permission Denied when I try using a credentials file. When I do it from command line as root it ...
1
vote
1answer
71 views

Who is user “unset” in aureport?

I couldn't find this elusive "unset" user in /etc/passwd and there is no mention of him in man aureport although she scored the most number of hits on my audit log: # aureport -u -i --summary --start ...
2
votes
1answer
46 views

How to extract a list of user accounts deleted from the system over a period of 1 year? [closed]

I'm auditing an AIX and a Linux system and I would like to know how many user accounts were created and deleted over a 1 year period. Is there some way of getting this data from the Unix system?
0
votes
0answers
36 views

“Suggest” to RPM install the UID of a user that is going to be created?

In an RPM it's possible to create a system account; is it possible to suggest the UID to use? For example; during the normal install say that the UID in use was going to be 100; but I want it to use ...
2
votes
3answers
77 views

Redirect SSH user server side

I know that I can create shortcuts for specific users/servers on the client side via ~/.ssh/config or /etc/ssh/ssh_config, but I would like to do something similar but on the server side. That is, ...
2
votes
5answers
12k views

What is the command for listing all users who are members of the admin group?

I am looking for the name of the superusers list on Fedora. (On Ubuntu is seems to be "sudo".) I want to add one of the users to the superusers list. The groups command only lists the groups of the ...
0
votes
1answer
36 views

Adding new users from terminal session

Is there a way to add a new user from the terminal AND have the system setup their user profile? ie, create their home DIR and add then to the sudoers file? I'd like to be able to do this without them ...
6
votes
3answers
13k views

Creating an user without a password

I'm trying to create user without password like this: sudo adduser \ --system \ --shell /bin/bash \ --gecos ‘User for managing of git version control’ \ --group \ --disabled-password \ ...
1
vote
2answers
101 views

new users can't log in via GUI

I have added 3 new users to the system via a terminal session and defined their password. However at the GUI logon screen when I click on their account and put in the password I get the spinning wheel ...
1
vote
1answer
47 views

Why can't I login in as the ftp user?

After installing vsftpd I have the user ftp on my system. I assigned a password to this account. However, I still cannot login as the ftp user (on the command line, without any ftp-protocol involved). ...
2
votes
1answer
67 views

Why is there a ! in the password hash?

In /etc/shadow, I have a line that begins: ubuntu:!$6$Pi4BKmX8$........................ Why is there a ! before the $6$ in the hash?
2
votes
0answers
37 views

How to use a separated user with GUI on OpenBSD?

A webbrowser is a GREAT attack vector since people use it to access the "dangerous" internet. Very bad things can come in through to the desktop. So in general for a desktop, we can do the ...
10
votes
1answer
2k views

User permissions inside and outside of LXC containers?

I'm running some services inside of Docker LXC containers on my server and I'm beginning to actually do serious things with them. One thing I'm not clear on is how user permissions work inside and ...
3
votes
1answer
193 views

Why does every user have his own group?

One thing I've noticed in a lot of recent distros is that users all have their own groups with the same name as their user name. What's the purpose of that? Groups are made to group users together in ...
2
votes
2answers
67 views

How to prevent a new user to inherit the files of a deleted user?

I just deleted a user with "userdel", without deleting its home dir. Right after the deletion, I created a new user, with its own home dir. What striked me as odd, was that the new user gets the UID ...
1
vote
1answer
417 views

What steps to add a user to a system without using useradd/adduser?

I was browsing through some Linux questions and saw this interesting question. What steps to add a user to a system without using useradd/adduser? The one possible way that comes to my mind is, ...
1
vote
1answer
511 views

Switch User won't work in Xfce

I'm trying to do Switch User in action buttons but gets me following error : Unable to start new display GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name ...