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

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5
votes
2answers
4k 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
770 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
3k 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
0answers
286 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
130 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
251 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 ...
11
votes
2answers
2k 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
1k 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
143 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
1k 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 ...
6
votes
1answer
866 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
12k 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 ...
2
votes
5answers
17k 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
276 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
733 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
239 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
454 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
763 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
1k 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
700 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 ...
7
votes
1answer
9k 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
3k 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
6
votes
2answers
1k views

UID of a deleted account

How can an administrator find the UID of a user that's been deleted with the userdel command?
10
votes
5answers
17k 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 ...
8
votes
1answer
3k 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, ...
13
votes
3answers
21k views

Which users are allowed to log in via SSH by default?

When I set up my Debian 6, I was wondering, which users apart from root whose password I know can log into my system via SSH? When I install Apache 2 a user called www-data gets created. Does this ...
11
votes
4answers
38k views

How can I look up a username by id in linux?

The command id can be used to look up a user's uid, for example: $ id -u ubuntu 1000 Is there a command to lookup up a username from a uid? I realize this can be done by looking at the /etc/passwd ...
5
votes
1answer
572 views

Run script when specific users logout

I need to run my application in screen when specific users are logged out and kill the screen when someone from my user list logged in. So I am thinking about bash script, which will be called ...
2
votes
1answer
672 views

Why am I not able to login directly using SSH

Suppose, the server address is abcd.com. On my local machine at my workplace, I have to login to that server, using ssh <my employeeid>@abcd.com Then, to login to user myname , I have to use ...
4
votes
3answers
1k views

Extract dates from /etc/shadow

The file /etc/shadow has a couple date fields that are expressed as the number of days since Jan 1, 1970. Is there an easy way using to get a list of users and the calendar date of the last password ...
11
votes
4answers
22k views

can we know the password for the other users if we have root access?

If a person has root access to a particular RHEL machine, will they be able to retrieve the password of the other users?
8
votes
2answers
761 views

How do I add network or user source connection data to history entries?

I would like to modify the history settings for all users on the systems that I manage. I would like it to contain the information from the connecting terminal like from who sysadmin:/ # who sysadmin ...
0
votes
2answers
283 views

Best practice when installing programs in FreeBSD?

Just started with FreeBSD and I am not sure whether I need to be root to install programs or not? For example, the manual for installing X11 never says that we should issue su command. However - it ...
2
votes
1answer
271 views

dm-crypt and LUKS password rotation

How do you protect the master key, and distribute multiple passwords for admin access? Is there a 3rd party user management tool or is this native?
16
votes
2answers
19k views

How to create a user with limited RAM usage?

So I have 4 GB RAM + 4GB swap. I want to create a user with limited ram and swap: 3 GB RAM and 1 GB swap. Is such thing possible? Is it possible to start applications with limited RAM and swap ...
6
votes
1answer
485 views

How to disable Switch User option from Fedora 15

Is there a way to disable the Switch User option from a locked screen on Fedora 15? I've tried this way, but no luck, since gconf-editor has no effect.
1
vote
1answer
8k views

switching from user to root and revers (FreeBSD)

I want to make some modification with root and then with my user, in fact I want to install sudo and he give me the error in the first step: cd /usr/ports/security/sudo make install clean ...
4
votes
1answer
1k views

How to clear the last -10 info?

How to clear the last -10 information only for a Linux system? I tried to execute the command > /var/log/wtmp to clear the last info, but it clears the whole login info , but I need to clear only ...
3
votes
2answers
4k views

New user can't login in Linux Mint

I have created a new user in Linux Mint 12 with these commands: sudo useradd irene sudo passwd irene //Here I entered the password But if I try to login with this user, the screen goes black for a ...
1
vote
2answers
1k views

Allow non-root process to access all home directories without compromising security?

Any ideas how to allow one non-root process to access (read&write) all home directories without compromising security? Normal users should not have access to each other's home directories. All ...
2
votes
3answers
131 views

Is unix good with many users/groups?

If I have 10,000 webapps on my server and I'd like enhanced permissions and make a user for every app (/var/www/NAME will have a matching /tmp/www/NAME), will everything be fine or will problems occur ...
1
vote
2answers
5k views

Changing user in a script?

I am trying to change user in order to execute a specific command during startup. It fails silently and apparently the userchange isn't carried out as I can tell that the command isn't executed. What ...
6
votes
2answers
1k 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 ...
4
votes
1answer
494 views

How do I stop Apache from running as root?

New on the job, small place, and the security stuff just landed on my desk. I was hired to be a front-end developer. Happy to learn new things, but never had to do sysadmin stuff before. I started ...
2
votes
1answer
937 views

Ubuntu 11.10 Server: create user, home directory, sudo privileges: command line only

I have a rackspace server and I'm having problems with configuration. I need to lock it down and throw away the key, because right now I can only login with root to do anything substantial. I also am ...
7
votes
3answers
13k views

Can I search bash history across all users on a server?

I want to see all bash commands that have been run on a Linux server across multiple user accounts. The specific distribution I'm using is CentOS 5.7. Is there a way to globally search .bash_history ...
25
votes
2answers
61k views

What user should apache and PHP be running as? What permissions should /var/www files have?

I just spun up an Ubuntu 11.10 box and then ran apt-get install apache2 php5 to install apache2 and PHP 5 on the box. Now it is functioning as a "web server" and it loads the "It Works!" page. Now I'm ...
3
votes
1answer
1k views

How do I add a local user to a box that uses LDAP authenticaiton?

I'm working with a box that uses LDAP for user authentication. However, I need to add a local user to run some services and I don't want non-person users junking up the LDAP directory. Does anyone ...
7
votes
1answer
13k views

How do I set the user of php-fpm to be php-user instead of www-data?

I am using php-fpm on debian with nginx for php5 support. I would like to have php-fpm to be under the user&group php-user instead of www-data. I thought the init.d script would have the user ...