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

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3
votes
1answer
64 views

chpasswd and openssl

I'm trying to pass an MD5 password to chpasswd but it doesn't seem to work. echo username:$(openssl passwd -1 -salt salt password) Then I try to pass this to chpasswd to change the password echo ...
3
votes
1answer
93 views

Why there is a group member field in both /etc/group and /etc/gshadow

I am learning more about Linux user and groups in depth and noticed fourth field in both /etc/gshadow/ and /etc/group are exactly same. Do they have any difference or is there any special reason why ...
2
votes
1answer
44 views

how to prevent access to other user with same user id (UID)

I have two Linux OS installed in two partitions in my system. However I have few usernames which are common in both partitions. For ex, I have user friend in both the OS. I have noticed that friend ...
2
votes
0answers
48 views

How to kill all vpns on switch user Mint 17.2

I'm using mint 17.2 cinnamon. I'm not particular about the method, just want it to stop all vpn connections (openvpn, listed in network manager) when I switch users or logout. nmcli doesnt provide a ...
9
votes
1answer
154 views

How can I create an account with a copy of the same home folder?

I have a 'user1' account with the home folder set up. I'd like to create a 'user2' account with a copy of the same home folder setup. Is it possible to do this?
3
votes
1answer
185 views

Why useradd -m doesn't fill created home dir with some defaults?

My motives: I want to create deployment script which prepare all system with just 1 click, and although learn Linux this way. So I don't want to use interactive utils like adduser (all interaction ...
7
votes
4answers
4k 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 ...
47
votes
5answers
77k views

Disable a user's login without disabling the account

Let's say I create a user named "bogus" using the adduser command. How can I make sure this user will NOT be a viable login option, without disabling the account. In short, I want the account to be ...
0
votes
1answer
162 views

user exists when trying to add user to systemd-journal group.

I have been wanting to read systemd-journal by running/using journalctl -b . Now if I run it as a user I get the following :- $ journalctl -b Hint: You are currently not seeing messages from other ...
1
vote
2answers
100 views

Which user is running the most processes?

My top looks like this: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 6524 asjzdiwq 30 10 500m 41m 24m S 0.0 0.3 0:15.27 php-cgi 21274 asjzdiwq 30 ...
3
votes
3answers
142 views

How can I run a program as another user in every way?

Background I'm trying to restart some programs (mail-notification and stalonetray) regularly, as they appear to die frequently. I want to set restart them whenever NetworkManager reconnects. Hence, I ...
0
votes
0answers
26 views

newusers causes segfault

I am trying to bulk-add 433 users via newusers. The newuserlist.txt file I have contains users with up to 16 chars usernames with questionable patterns (numbers at the beginning and capital letters). ...
2
votes
0answers
47 views

Changed username - Could not update ICE authority file

I tried to change my username by creating another admin account, restarting, then logging into that new account. Then, I entered the following command: sudo usermod -l NewUserName -d ...
0
votes
1answer
2k views

$USER != whoami

I'm trying to re-install homebrew on my mac. I get this error: michaels-1856:~ michael.snowden$ ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" ==> This ...
2
votes
2answers
3k views

When trying to change username, terminal tells me user is currently used by process

I am trying to change my username, as per advice here however after running the following command: CurrentName@HostName ~ $ sudo usermod -l TheNameIWantToChange -d /home/TheNameIWantToChange -m ...
0
votes
2answers
117 views

How to add “system” local user like mysql or tomcat?

My system has a lot of users, I'v never created, like mysql or tomcat. These users have no home directories inside /home Obviously, a daemon programs run under these users. What is the term for such ...
3
votes
0answers
91 views

Use network-manager in different netns

In continuation of my last question about using netns as a relugar user, I'm now looking for a way to open VPN tunnels as a regular user. So I naturally thought about network-manager. Any user can ...
0
votes
1answer
252 views

Creating a new FTP user and giving him only the right to 1 folder [duplicate]

I have a Linux Debian machine that I own (root access). I would like to create a new user called "testuser" and give him the right to view, edit and delete files from only one specific folder ...
12
votes
2answers
38k views

How to add a ssh user who only has permissions to access specific folder?

How to add an ssh user who only has permissions to access specific folder? useradd -d /var/www/xyz.com.tr/musteri -s /bin/bash -g sshd musteri I created a user called musteri. I set its home ...
7
votes
2answers
97 views

How to completely remove the user subsystem from Linux?

Is it possible to completely remove the user subsystem from Linux. I'm NOT talking about preventing people from logging in. I'm talking about removing the parts of the system that even make it ...
0
votes
0answers
62 views

root's login shell is invalid, how do I restore it?

I have accidentally changed the root user's shell from /sbin/sh to /sbin/false. I don't have any other login and the only way I can access to system is through SSH. How can I retrieve back root ...
2
votes
1answer
115 views

How to Use who/w with Non-Interactive SSH logins

I'd like to perform selective shutdown of a server in my house after backing-up over SSH. My post-backup script waits for five minutes and then runs a very short 'safe shutdown' script located on the ...
0
votes
0answers
70 views

Creating a new user for FTP with access to a specific dir

After following all of the instructions found here: How to create a FTP user with specific /dir/ access only on a Centos / linux installation I am having some troubles. For some reasons the new ...
-2
votes
1answer
379 views

Changing normal user uid to 0 to normal uid

I have given a normal user root permissions on Linux by using this command: usermod -u 0 -o username How can I go back and make the user a normal user again? ex: # grep Jack /etc/passwd Jack ...
1
vote
2answers
105 views

Lock a user with his home folder

Is there any way of making a user only able to see and modificate his home folder? I am currently on arch linux. Just explaining a little better, the user would not be able to see /etc or any other ...
8
votes
4answers
30k views

Proper way of changing username in Ubuntu or any linux

I am using Ubuntu 12.04 and made some customization. I will also make it a new iso which is customized ubuntu. What I want to ask is how can I change my username. There are plenty much configuration ...
0
votes
2answers
292 views

What user should I create and execute cron jobs as? Apache? Root? Me?

I'm setting up a new Webserver and having trouble getting cron to execute as expected. I am using a script to create cron jobs in .tmp/crontab.txt, which is then moved to /var/spool/cron under the ...
-1
votes
2answers
216 views

Passwordless login (physical console and “su - user”)

How to configure an user (in debian) to login without password ? An user without password shall login in text console and using su - user without being asked for password. (secure isn't a requirement ...
0
votes
0answers
28 views

sftp user with appropriate permission

I'm new to linux user permissions and having trouble configuring a user. So the scenario is, I have apache installed on centos. I've a virtual host with document root at /var/www/sitename/public_html ...
0
votes
0answers
69 views

How to Duplicate user?

I'm in Cloud 9 IDE, and I want to clone the default user for better collaboration. I know it's not just a simple copy of the /home/<username> folder from Archlinux wiki, which tells me about ...
2
votes
1answer
335 views

Checking how long a user has been logged in

Is it possible to check for how long a user has been logged in? Or when the user logged in on an Unix/Linux system? I logged in as another user on my system a while ago and I would like to now how ...
5
votes
3answers
18k views

Restrict FTP user to a directory

Sorry if this is an obvious question, but I don't have a lot of knowledge about this sort of thing, and I've googled for hours, nothing worked. So on a Ubuntu 11.04 server, I want to restrict a user ...
8
votes
2answers
14k views

Running chsh does not change shell

I want to change my shell from bash to zsh. I have tried running the following while logged in as user zol: $ chsh -s /bin/zsh $ sudo chsh -s /bin/zsh zol $ su -c 'chsh -s /bin/zsh zol' # The above ...
0
votes
1answer
59 views

Where do service permissions come from

I'm trying to broaden my knowledge of the events surrounding system startup. I see that there are many process which are started without root level permissions. e.g. rsyslogd is listed as running ...
1
vote
1answer
655 views

usermod always reports user does not exist on RHEL 6.6

My RHEL 6.6 VM is running behind Centrify Active Directory. When I do sudo id 'any_existing_user' it will give back info about that user. But when I do sudo usermod -c 'Comments' ...
2
votes
2answers
1k 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 ...
14
votes
1answer
7k views

In /etc/group what is the meaning of the second field?

A sample /etc/group file contains the following entries: root:*:0: adm:!:4:logcheck antoine:x:1000: The man pages I've read (Debian & OSX) says the second field is to store a group password. ...
2
votes
2answers
262 views

Can I log in into a system user after I create him?

On an Ubuntu machine, if I run the following command: adduser --system --no-create-home system-user I create a system user named system-user without home directory with /bin/false as the shell. This ...
27
votes
3answers
14k views

How can I determine if someone's SSH key contains an empty passphrase?

Some of my Linux & FreeBSD systems have dozens of users. Staff will use these "ssh gateway" nodes to SSH into other internal servers. We're concerned that some of these people use an unencrypted ...
2
votes
1answer
849 views

User created with different UID and GID

I'm creating a new user in my system, by calling: sudo useradd -m -G nas -s /bin/bash alf which supposedly should create a new user with the same UID and GID. However the passwd file is appended ...
1
vote
1answer
59 views

How to find userID after login as root using pmksh?

I am trying to gather the username of the actual person logged in the server instead of just showing root. After entering pmksh, the prompt changes to root@hostname. When I do echo $USER the result ...
1
vote
1answer
847 views

Linux/Unix username length limit

Would it be difficult to increase the limit or would it just be a one-place change? I have a system that could really elegantly make use of the Unix multiuser model for process isolation but I'd need ...
0
votes
0answers
276 views

Using CentOS as a thin client

I have about 50 desktop PCs running CentOS. These will be used as "thin clients" for users to access their real desktops (VMs) using some flavor of NX technology. So, the PC on the user's desk is a ...
1
vote
2answers
34 views

User verification

Suppose I've writen a setuid root executable and I want it to verify that the user is not a script by asking the user to provide his/her password (granted, users might save their password and use that ...
1
vote
3answers
29 views

Set up a user for a program

/etc/passwd shows many "virtual" users that are essentially for programs to use, rather than for people. How do I go about setting up such a user? All I need is a user that isn't used for anything ...
2
votes
5answers
16k 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 a user. Once we do not put a password we can directly log in to the ...
1
vote
2answers
72 views

The Deny the permission of mounting any drives to a user

I'm using Linux Mint 17.2 Cinnamon. There are multiple partitions on /dev/sda. /dev/sda1 is where the system resides, /dev/sda2, ..., /dev/sdaX are NTFS partitions. There are two users admin and ...
10
votes
4answers
2k views

what does star in passwd file mean?

I have a computer that I need to boot into, but the passwords seem to be bogus. Additionally i cant mount the drive for writing, and it is a mips processor, so I cant stick it in another machine to ...
1
vote
2answers
5k 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: ...
1
vote
1answer
43 views

Restricting CPU time of processes by executable path

Is there a way to restrict CPU time (duration) for all processes which are invoked by executables that are located in a certain directory? I would like to be able to auto-kill all applications which ...