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

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7
votes
2answers
565 views

chown removes sticky bit: bug or feature?

Steps to reproduce: germar@host:~$ cd /tmp/ germar@host:/tmp$ touch test && chmod u+s test && ls -la test -rwSr--r-- 1 germar germar 0 Nov 2 20:11 test germar@host:/tmp$ chown ...
9
votes
1answer
367 views

Why are user IDs recycled?

The other day, I deleted a user from one of our servers. That user had the ID 1002. Today, I've added a new user to the system. To my surprise, he got the user ID 1002. Because I neglected to delete ...
0
votes
1answer
799 views

Difference between passwd and passwd- file [duplicate]

Possible Duplicate: Who creates /etc/{group,gshadow,passwd,shadow}-? I have a strange passwd- file in /etc, notice the trailing dash: root@ubuntu:~# ls /etc/passw* /etc/passwd ...
5
votes
2answers
372 views

How to disable login for an user?

My Linux has many not-human users like cron, ntp, daemon, http, etc. I want to disable anybody to login as any of this users. Real people on my machine are root and me, so only root and me should be ...
3
votes
2answers
200 views

What is the proper solution to a web server trying to write to a directory?

So, I have a box with a "deploy" user. This deploy user owns a code repository and wordpress is running on this box... When wordpress attempts to do something like upload a plugin, it is using the ...
2
votes
1answer
62 views

Optimal way to setup user account / accesses?

I have a (home) Ubuntu machine; upon installation I created the "x" user during the installation (who is not the root) so often when I want to run apt-get or other things that require write access to ...
1
vote
1answer
182 views

For an init.d startup script, what is the ideal user to use as the owner of that process

Everyone says that running processes as root is bad, since it defeats the security and privileges model. But what user should be used to run a startup process? Is it really necessary to create a new ...
4
votes
1answer
282 views

Force pubkey-auth user to set password at first login

When I create a new user account I ask users to send me a public key, and want to force users to set the password the first time they log in with keypair authentication. If I create an account with an ...
1
vote
3answers
169 views

User's name appears as “bash-3.0” on SSH shell

I am working on a Redhat server and one of the users' names appears as "bash-3.0" on the "SSH Secure Shell Client." His name is appearing correct under /etc/passwd. How could this happen? How can I ...
2
votes
1answer
163 views

Home folder name with Unicode characters? [duplicate]

Possible Duplicate: Does character 'ä' in usernames cause bugs in linux systems? Is it possible to create a user with a Unicode login name (and home folder name) ? For ...
3
votes
3answers
2k views

Another account with same uid as root gets prompted to set new password for root, not itself

After upgrading the os from 5300-06 to 5300-11, this weird behaviour happened. My system had another unix account, let's call it "abc", purposely configured its uid to 0 for working as a root with ...
1
vote
2answers
136 views

Login to super user for running script

I have sample.sh script in /u01/dump location. I'm running it from root. My requirement is while running the sample.sh script it has to be login as oracle1 user using SU (super user) and display all ...
0
votes
2answers
622 views

How to suppress su authentication failure warning?

I created an account "diag" and set it as expired (usermod --expiredate 1). Then I have a script which I want to run to log into it, so in the script I use the following command: su -s /bin/bash - ...
0
votes
2answers
3k views

Avoid asking password if `su -m user command` is used under `user`?

If I run the script containing su -m user service userservice start under root user, I do not need to enter the password. But when I run it under user user, it asks passwords all the time. That really ...
6
votes
1answer
366 views

/etc/passwd sql with bash access

I just got a CentOS VPS and was reviewing the passwd file and saw this: mysql:x:498:499:MySQL server:/var/lib/mysql:/bin/bash Is bash necessary for mysql?
3
votes
1answer
214 views

Can linux use a mix of SHA-1 and CRYPT passwords?

We have an automated sync-routine that uses useradd to create new users on a Ubuntu 10.04 machine. The application launching the routine provided both username and CRYPT-encrypted password. However, ...
1
vote
1answer
178 views

Copying a directory to multiple users home dir and changing user/group ownership

On my Ubuntu server there are about 150 shell accounts. All usernames begin with the prefix u12.. I have root access and I am trying to copy a directory named "somefiles" to all the home directories. ...
4
votes
1answer
3k views

Group within group file permissions

I tried finding this on here, but couldn't so sorry if it's a duplicate. Say I have 2 groups and a user: group1, group2, user1 with the following structure: group1 is a member of group 2, user1 is a ...
3
votes
1answer
1k views

SSH not landing in the home directory

I have recently installed Raspbian into a Raspberry Pi. As part of the installation process I changed the user name and group from the default (pi) to my own (let's call it user) using usermod and ...
1
vote
2answers
366 views

Can't SSH/FTP into new user account in Ubuntu?

Created new user from shell script using following command: sudo useradd $1 -p $2 --home /var/www/$1 I'm not able to login to FTP or SSH as that user, do i need to add the user to some group for ...
3
votes
2answers
577 views

Start Vim as my user with root privileges

I have my custom Vim files in ~/.vim and settings in ~/.vimrc. However, sometimes I have to edit some files in /etc and such. If I start Vim like this: $ sudo vim /etc/rc.conf I lose my config ...
8
votes
1answer
2k 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
4answers
1k views

Allow paswordless user to change to another passwordless user

I have two users dev and tomcat neither of them have a password. How can I allow dev 1 do su - tomcat without having him having to enter any credentials? 1 connects with ssh keyfile
5
votes
2answers
3k views

How do I add a guest account to Linux Mint 13?

Is there a way to add a guest login account on welcome screen of Linux Mint 13 MATE-32bits, similar to the one present in Ubuntu 12.04?
1
vote
1answer
373 views

Correct owner, group and permissions when mounting an image file

Suppose I have an image home.img of a home partition of another linux machine (B). On that machine there is a users userB and there is a special group, groupB. Consider for example a file fileB in the ...
2
votes
1answer
1k views

file system uid and gid in linux

I came across a linux kernel tutorial and there they talked about 4 pairs of identifiers and one of them was file system uid and gid. Could someone explain me what it is and how it is different from ...
2
votes
1answer
234 views

What user installs a .deb package?

I am experiencing a behavior in the installation of a .deb package that I don't really understand. I have a set of "things" in my computer that I deploy to remote computers using a .deb package. I ...
2
votes
2answers
119 views

How to generate folder ownership lists for each user?

I'd like to generate several separate lists for each user in Ubuntu. The lists contains the files and folders belong to each user. Using the command following list me all the users in the system: ...
3
votes
0answers
170 views

Will a account get locked while logging in FTP mode to a remote server whose password has already expired in UNIX

I have a FTP user id to a remote server, the password for which has expired.The account is getting locked if connection is being made in FTP mode to the server with the old(expired) password. Is ...
9
votes
2answers
913 views

Why is /etc/passwd open to public for reading?

Is there any reason that /etc/passwd should be world-wide readable ? It's not like password hashes that shouldn't be exposed, I just want to know why.
2
votes
3answers
807 views

Limited SSH user on Ubuntu 12

I'm running Minecraft on a server. How can I give my friend SSH access just to the minecraft folder (a root folder), the screen command, and some ports?
4
votes
1answer
131 views

In crontab is it possible to specify a user from a variable?

I am trying to have the following cron executed with a certain user. U=`/usr/bin/w | grep -w :0 | awk '{ print $1 }'` */1 * * * * $U /opt/script.sh It seems the deamon doesn't know how to interpret ...
4
votes
2answers
704 views

How can I make all my processes start with niceness 5

I know that niceness values are inherited from the niceness value of the parent process, but can I globally change the default niceness value for a particular user (myself). In this case I have a ...
5
votes
1answer
332 views

Is it safe to use /bin/cat as shell for a restricted user?

I need to remontely log on to few peoples machines to do maintanance tasks, but sometimes the machines can be behind firewalls or NAT's. The way I have been doing it is to give the user advice on how ...
4
votes
1answer
4k views

How to create a user with given password on SuSE from command line?

I need to create bunch of new users with given password. What I want is a script that I would pass the user name of new user and it will create/add the user and set its password. (the password is the ...
1
vote
5answers
6k 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
157 views

what does 'old' mean in the output of `who -u`?

Title says it all. In the listings of who -u, some of the records show the string "old" in the idle time column. I know that "." means the session is not idle. What's the meaning of "old"? The ...
7
votes
3answers
573 views

Prevent a unix account from being able to SSH [duplicate]

Possible Duplicate: Disable direct login for normal users (like oracle) in linux but allow scp and sftp? I want to prevent a unix account from being able to be SSH'ed with, but it should ...
0
votes
1answer
212 views

Incompatible group permissions in Linux - Is it a bug? [duplicate]

Possible Duplicate: How to apply changes of newly added user groups without needing to reboot? I am on Ubuntu 11.04. I am creating another user and placing an existing user in the group of ...
1
vote
1answer
1k views

How to create an user only with SSH -access and easily-set-up .ssh -dir perms?

I often mess up when I manually set up the .ssh -dir, easy to forget some flag. I often need to create a new user and only allowing access with SSH, how can I do that? Basically, I want to stop doing ...
1
vote
1answer
338 views

Is there a shorter way to change username, home directory and move files at the same time

I wanted to use and have tried sudo usermod durrantm_test -mdl durrantm_test2 but I get Usage: usermod [options] LOGIN ... However sudo usermod durrantm_test -l durrantm_test2 -md ...
2
votes
2answers
503 views

How to set permissions what users can see (drives, folders) on opensuse 12.1?

I have a several users on one machine and its needed to specify which user can access (read & write) specified folders and/or mounted drives. First of all, one user shouldn't see a ...
5
votes
1answer
444 views

Is it possible to find times of past user sessions?

Using the who command, I can find which users are currently logged into a machine. I would like to determine which users have logged into my machine in the past, and the length of those sessions. Is ...
1
vote
1answer
536 views

Creating a proFTPd user

I'm setting up a proFTPd server so I can upload files to my webserver, but I've never tried this before. I've installed proftpd, added a user with a home folder: /home/FTP-shared and added /bin/false ...
4
votes
1answer
4k 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 ...
4
votes
2answers
2k views

/etc/shadow and /etc/passwd format compatibility

Are formats of files /etc/shadow and /etc/passwd same on all unix and unix-like systems same or are there significant differences? I mean syntax of files, not file location or name
1
vote
0answers
276 views

Adding a second user to a system group? [closed]

I am trying to get around a permission issue I am having. The only reasonable option (other than ACL) is to add the user that needs access to the system group of the user that has access. Yes, the ...
6
votes
2answers
771 views

UID of a deleted account

How can an administrator find the UID of a user that's been deleted with the userdel command?
8
votes
5answers
9k 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
1answer
2k views

How can I do NFSv4 UID mapping across systems with UID mismatches?

I am working in a lab with three Ubuntu systems, and I would like to cross-mount some filesystems via NFS. However, while the systems have some of the same usernames, the UIDs and GIDs don't match, ...