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

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2
votes
1answer
76 views

skill on your own session

So I kind of (read: did) run skill -STOP -u <username> on my own session... and I don't have root privileges on the machine. Short of getting the sysadmin to restore things (he's away), is ...
7
votes
2answers
2k views

How to restrict internet access for a particular user on the lan using iptables in Linux

Let's say there are two users on the LAN, A and B. How do I restrict user A from internet access using iptables rules and saving the rules so that after reboot, they are still effective. And suppose I ...
10
votes
2answers
4k views

How do I leave a message for another (local) user?

I know you can use write to send a message to a currently logged in user, but how do you leave a message for a user who is not logged in? The solution I have seen is modify the motd, but that will be ...
3
votes
2answers
180 views

Execute command on shared account login

At work our team uses a shared account "appadmin" to administer our application. At login, each one of us sources an "aliasrc" file containing his or her preferences. (aliases, display, prompt, ...). ...
2
votes
1answer
724 views

NFS to clients with different uid:s than on the server, where the client uid:s shall not show up in the server

I have a problem with a embedded Linux device that is mounting its root filesystem over NFS. But for different reason the embedded device is a single user device running as root (and later it will ...
7
votes
3answers
710 views

Does character 'ä' in usernames cause bugs in linux systems?

I want to use my first name as an username but it contains character 'ä'. I found this thread. Now I understand, why some some characters are disabled, but what about 'ä'? Can this character cause ...
21
votes
5answers
2k views

Recovering from setting root's shell to a bad file

Let's say I've gone and done a silly thing, such as using 'chsh' to change the root user's shell to a bad file path. Future logins to the root account will abruptly fail, citing /bin/whatever not ...
4
votes
2answers
974 views

How to see who is logged on to many workstations?

Before I go to work creating my own I would like to find an existing system to do the following: Provide a concise list of users logged on to any of the workstations Show workstation host name, IP, ...
6
votes
1answer
455 views

Backing up and restoring a system user account

How would I go about completely backing up a user account and restoring it on a new system? The Home directory is just 'copy-and-paste'. But then what about things like the account password; and its ...
3
votes
1answer
2k views

User logged in by sftp does not show up in `w`

My server is Centos 5. I have a chroot environment set up with the following in my sshd_config Match group sftponly ForceCommand internal-sftp ChrootDirectory %h AllowTcpForwarding no ...
3
votes
1answer
4k views

smbpasswd failed for new Samba install on fresh Ubuntu 11.04

I've installed Samba on a fresh Ubuntu install. I run the command sudo smbpasswd -a someuser New SMB password: Retype new SMB password: Failed to add entry for user someuser. I've read that you ...
2
votes
3answers
325 views

Group information reported wrong for a specific user

I have a problem on a server I manage. An account (specifically, my account) does not seem to have the correct groups. I think the problem is most easily demonstrated by looking at the following ...
2
votes
1answer
127 views

Suddenly changing users [closed]

Has anyone ever encountered a scenario where you are logged into a system going about your standard business, cat, ls, tail, grep, vim, find etc. and suddenly permissions to regular things stop ...
28
votes
4answers
28k 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 ...
15
votes
2answers
7k views

How to apply changes of newly added user groups without needing to reboot?

Assume I'm logged in with user takpar: takpar@skyspace:/$ As root, I've added takpar as a member of group webdev using: # usermod -a -G webdev takpar But it seems it has not been applied. because ...
3
votes
2answers
5k views

How can I have a separate umask for directory or user?

I want a separate umask for a directory or a user. How can I do this? Edit: I am using Debian 6. The reason why I want to do this is, I want all my SFTP users to create files with write on group. ...
6
votes
3answers
11k views

Correct permissions for /var/www/html?

I'm able to write changes in the home directory, but when it comes to the /var/www/html folder, it's not allowing me to make any changes or create new files or folders. I'm able to view the files in ...
8
votes
2answers
7k views

GID, current, primary, supplementary, effective and real group IDs?

The following links discuss these concepts in different contexts. I have read their definitions, but I still can't tell how they are related, or if some of them are just the same. Current group ID ...
4
votes
2answers
572 views

Permanently switching to zsh in a script, without being root and without being asked for the password

Is there any way to run chsh -s /bin/zsh without being root and without being asked for the password? I want to put it into a non-interactive script that isn't called by root.
6
votes
4answers
17k views

How can I create and grant a normal user with root privileges?

I'm wondering how to create and grant a normal user (for example, named 'sybase') with root privileges? I found useradd, adduser, and passwd to be useful, but are there any other files to modify to ...
6
votes
3answers
2k views

Can I allow a non-root user to log in when /etc/nologin exists?

Suppose a non-root user with sudo privileges executes a delayed shutdown (shutdown +10 or whatever) and logs out. Then, before the shutdown occurs, he wants to log back in and cancel the shutdown. The ...
5
votes
4answers
1k views

How sudo/root-ness detection works

Programs that make changes system-wide require sudo unless I am already the root user. Now, the question is: how exactly does the system figure out that I am (not) root? Does it: Check to see if ...
3
votes
1answer
155 views

Duplicate a user, or at least the password

I have some application that needs to create users that have the same password as others. Is there a way to do this without having to edit the /etc/shadow manually? Some sort of command?
1
vote
1answer
289 views

Verify that /etc/passwd has correct number of fields on each line?

I'm looking for an easy, portable way to validate the number of fields in /etc/passwd, /etc/shadow, /etc/group and /etc/master.passwd. This would run on FreeBSD, Linux and other Un*xes. pwck does ...
6
votes
1answer
6k views

How can I create users with only remote ftp access on Linux server?

I'm running a Ubuntu 10.04 LTS server and I want to create users who can only access the server from ftp. What I did so far is: Install vsftpd Create new user with default login shell set to ...
4
votes
1answer
496 views

Why do I need to use newgrp or su (or logout and login again) to have new group memberships applied?

What is it that makes new group membership require a new login (or new login shell as started by su or newgrp) to be visible? Just running another bash (or whatever other shell) instance with --login ...
6
votes
2answers
20k 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 ...
2
votes
2answers
152 views

How to create a new user without his own FS but with access to write to only one folder of user that creates him?

What are the command(s) to create a new user (not from su), give him the ability to write to only one folder which is some directory owned by an already existing user (the one that created him)? ...
2
votes
1answer
192 views

'who' has no output

I'm new to Arch Linux, and I just built my system up. But when I ran who in urxvt, I got nothing. Anyone know what's going on? BTW. I use Slim + OpenBox. And here are parts of my configure files. ...
6
votes
1answer
7k views

Mounting an ext3 fs with user privledges

I'm trying to mount an ext3 file system from another linux installation so that the user, not root, will have full access to all the files. (I really do need user to have access to those files, ...
1
vote
2answers
5k views

How do I log out of all my active sessions?

For some reason, I have a few open sessions on an SSH server that I don't know about. I assume they're leftovers from when my pipe broke. $ users user1 user2 user3 me me me me Is there a way to log ...
10
votes
6answers
5k views

What does the “number” in the owner field of files signify in linux?

I copied many files to my new linux host. I see that all files have the owner and group both set to 515. What does that mean?
2
votes
2answers
1k views

SFTP with Mysql user pass instead of PAM

Is there a way for people to log onto a debian server via sftp using just mysql database table as authentaction. IE not adding a user to the system? I know it can be done over ftp and TLS but i ...
2
votes
2answers
284 views

using chown in linux

I want to assign www-data user full rights in folder /var/www/ and all of the files inside this folder. I have tried chown www-data /var/www/
1
vote
1answer
66 views

Equivalent of newusers for groups

The newusers command is useful for adding or modifying users in bulk. Is there an equivalent command for managing groups?
9
votes
3answers
3k views

What is the point of the 'operator' user?

Many un*x systems ship with a user account named 'operator'. What is the purpose of this account? Do some systems actually make use of this account, or is this more of a historical legacy? Have you ...
2
votes
4answers
627 views

different shell for root and non-root user

When I ssh as root, my shell is bash, but when it's a non-root user it is sh. How can I make them both to use bash? This actually goes against the logic in this question: Why root's default shell is ...
6
votes
2answers
4k views

What are the allowed group names for groupadd?

I followed these instructions to build Shadow, which provides the groupadd command. I am now getting an error when trying this: $ groupadd automake1.10 groupadd: 'automake1.10' is not a valid group ...
4
votes
1answer
693 views

How to get the name of the user that launched `sudo`

My problem: I have a Python program, and the user launch it using sudo. Sometimes I have to get the user's home, and I can do this only knowing its name: import pwd pwd.getpwnam(username) So: how ...
6
votes
2answers
328 views

Using NIS without NFS

I'm configuring several computers in a lab to operate with the same login credentials shared between the computers, but without sharing the home directories. I'm considering using NIS for sharing the ...
3
votes
4answers
2k views

How to configure permissions to allow file access?

I'm running Wowza Media Server on my server as "root". The problem is that all files created (recorded) by Wowza are "root:root" and aren't writable, editable, or deletable by any other users. How can ...
2
votes
2answers
4k views

How can I switch one user to another in Freebsd?

How can I switch one user to another in Freebsd? For examples, I am user david now and I want to change to user Bob. This is a personal OS for my study. not a server. I searched it, but only got ...
5
votes
1answer
5k views

What is hvc0? (appearing in “who” list)

I have an Ubuntu Server, and when I type who, to see who's connected, I can see that there's a user connected, and instead of being logged to a pts/x, he's connected to hvc0. Is there something to ...
4
votes
2answers
5k views

How do I give all the permissions to a file for a single user that's not me?

When I want to grant access to another user to my file, I use chmod 777 file, but if I want to be sure I'm granting permission just for that user, how can I do it? -- update The file is owned by ...
7
votes
4answers
352 views

How can I safely give a shell to somebody?

I have a question about giving a shell account to somebody. How safe is it? He could read /etc. How can I give a secured shell account that will only restrict the user to some bins and his own home? ...
3
votes
3answers
4k views

Why is file ownership inconsistent between two systems mounting the same NFS share?

I have one IBM AIX server (serverA) which is connected to the san storage. I have created a volume group and also file system (jfs2) and mounted to directory /profit. After that I created a NFS ...
4
votes
3answers
3k views

How to find the machine from which a user logged into current machine using ssh?

In a multi server architecture, is it possible to find out from which machine a user logged into current machine using ssh? For example, user1 logged into host1. From there, the user logged into ...
3
votes
3answers
3k views

Reset all groups to default

I recently set up some groups and users on my machine, and now I want to remove all those users and all those groups. Somewhat stupidly, I read on an Ubuntu forum or something like that that it was ...
6
votes
1answer
2k views

Why can't I use arrow keys in terminal on Debian 6? (nonroot)

When I am on a non-root user I cannot use ↑/↓ to list my previous commands, and if I am typing I can't use ←/→ to say, add in a directory or to correct the ...
2
votes
1answer
3k views

How do I add a new user to an embedded Linux system by hand?

I have a system which was designed for use by root only and I want to run an FTP server on it. The software I use handles authentication by using same username and password as OS itself. To me it ...