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

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1
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1answer
193 views

Which user owns X display?

How to determine, as root, which user owns X display :0? (on a Fedora 18 system with defaults)
2
votes
1answer
272 views

bash script - supervisor program

I have to write a shell-script that have to do the following tasks: -in every 5 seconds it saves:     -how many users are using joe and/or vi;     -if ...
2
votes
6answers
680 views

sort ls output by users

On Linux, is there a way to sort ls output by users? What I try to achieve is something like this: user_a   file1 user_a   file2 user_b   another_file user_c   this_file user_c ...
1
vote
3answers
14k views

How can I list all user names on Solaris 10?

I forgot a user that I created on solaris 10, so now I would like to list all user names on my server. Is it possible (I am root user)? What command I should use if possible? Somewhere on the net ...
3
votes
2answers
2k views

How to grant non-root user access to device files

I have device file that appears in /dev when a specific board is plugged in. The read and write operations to it work just fine, but in order to open the device file the program needs to be executed ...
1
vote
2answers
705 views

FreeBSD telnet does not take root login

I have just installed FreeBSD 8.1 as a VMWare host and can establish ipv4 connectivity to the instance and telnet through the virtual console. I have also uncommented the /etc/inetd.conf lines telnet ...
15
votes
2answers
34k views

How can I change a user's default group in Linux?

Being new to Linux administration, I'm a little confused about the following commands: useradd usermod groupadd groupmod I've just finished reading the user administration book in the Linux/Unix ...
4
votes
2answers
96 views

Fully seperate two accounts without installing seperate operating systems?

Our class is finally installing Mint Linux on our machines. The problem is our teacher is scared that we'll play war games against the two classes that use the computers. His solution is to install ...
4
votes
2answers
666 views

How to set permissions in /sys/ permanent?

I'm starting X as a user and need to set my keyboard brightness in /sys/class/leds/asus\:\:kbd_backlight/brightness. The /sys/ directory gets recreated after reboot, so the permissions will reset too. ...
1
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0answers
39 views

Create a browser only session (Ubuntu) [duplicate]

I was recently in a Virgin media shop and was interested to see that they had laptops running Ubuntu for customers to browse the web on. The setup itself was interesting and I'm wondering if anyone ...
1
vote
1answer
2k views

Why useradd shows Permission denied error

I am working on CentOS 5.5. When I run the useradd command as root, then its working. But when I run the same command from one of the user, then it shows -bash: /usr/sbin/useradd: Permission ...
9
votes
2answers
23k views

User's Login date and login time

I want to fetch user's login time and login date, is there any command in Unix providing User's login date and User's login time ? this problem i want to perform in Shell-script where username is ...
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 ...
3
votes
1answer
183 views

Is running programs as another user useful?

After watching a talk by Douglas Crockford on security where he talks about how browsers got the right answer to the question "Who's interest does the program represent?", I wondered if it was ...
1
vote
1answer
859 views

Allow all group members to create directories and files

There are 2 users sftp_user apache Both users belong to the updaters group as well as other groups. New directories and files are created in the /updates/ directory. drwxrwsr-x 8 sftp updaters ...
1
vote
2answers
108 views

understanding how to run script securely as limited user

I'm a long time dev but linux newbie. I've been building this (http://tryperl.com) to learn linux. So, my question is just about some *nix stuff I don't fully grok. One of the things I want to do is ...
0
votes
0answers
136 views

Creating a Safe Web Server

Web server hosts multiple websites. Multiple users update each website. User home directory /home/user1 /home/user2 Web directory /var/www/site1 /var/www/site2 Each user uses SFTP to upload ...
1
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5answers
2k views

Hiding User from Last Command

Is there any way to hide a particular user's login entry from other users who run the last command?
3
votes
1answer
454 views

Is there a way to find out how many instances of the root user are logged into a Linux machine?

We have a handful of users that login to our Linux virtual machine as root either through the vSphere client or through SSH and I want to see if there is a way to tell if multiple root users are ...
3
votes
1answer
183 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 ...
0
votes
0answers
163 views

Buildroot: Unknown own user

I crated an image with buildroot. Everything went smooth. When I untarred the bz2 image in vmware and tried to boot into it then I observed an issue, in which, system is unable to recognize any user, ...
2
votes
1answer
119 views

What is the source of truth for currently active tty/pts connections?

I'm looking for a simple way to determine the number of currently logged in users, using only the filesystem and basic bash functions (instead of using binaries). The uptime binary appears to be ...
1
vote
1answer
92 views

Securely running LAMP under a specific user

I'm setting up a sandbox type of server that will be used by a couple users as a development environment and knowledge base. The server will have a web frontend so I've installed Apache, MySQL and ...
7
votes
1answer
783 views

How to stop users from Switching to Root user

I have disabled the root user login from Sshd.conf file so now no one can login using root user even if they know the password SOMEHOW. Now I have 3 users in server ROOT,EMERG and ORACLE. I want to ...
0
votes
1answer
272 views

Single-user binary installation location?

I'd like to install a binary for only my user, because I don't have root, and therefore don't have access to /usr/bin. I've tried ~/bin, and it can't find the binary. I'm on Mac OS 10.6.7. Is there ...
0
votes
1answer
253 views

SSH minimal rights user - su only [duplicate]

Possible Duplicate: Creating a UNIX account which only executes one command I am trying to setup a user account that only has as minimal rights as possible. The user should be able to log ...
0
votes
0answers
348 views

How to switch user if the Screen is Lock

Sometime this happen that when I had to do something on server I find that the screen is lock and I dont know the password of that user to unlock it and switch the user. So i need to know that How to ...
2
votes
2answers
40 views

Applying and linking all settings/binaries of one user to another user in Linux

In a linux machine, we may have to compile our programs with respect to that linux machine. Now, if we already have some other users (not root. A typical user.) who have already compiled many ...
1
vote
3answers
591 views

Linux Kernel: uid and gid vs /etc/passwd

How does the Linux kernel deal with UIDs and GIDs? When I want to add a user to a system, does the kernel require some type of "registration" for this user (syscall?)? Does the kernel even care about ...
0
votes
1answer
45 views

How to restore the user postgres?

In the second answer in this thread is a warning about changing the UNIX password for "postgres". I have already changed the password for "postgres". How could I restore the initially state of the ...
4
votes
2answers
90 views

Is it a good practice to have different users for different contexts?

I'm a software developer and I have a new laptop with Ubuntu. I plan to set up this laptop as a development workstation where I'll do my professional work (for my company) and also I'll develop some ...
2
votes
1answer
113 views

Is it possible to log directly into chroot?

Lets say I boot up my computer and I see the login screen. When I log in as myuser, I want to be restricted to a certain root directory via. chroot. Let's assume that the directory is ...
4
votes
1answer
849 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 ...
6
votes
1answer
3k views

Force the owner and group for the contents of a tar file?

I would like to create a tar file with contents belonging to an owner:group pair who do not exist on the system from which the file is being made. Here's the direction I've tried: tar ca ...
12
votes
3answers
14k 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 ...
12
votes
1answer
2k views

Can one PC be used by two users at the same time via dual-monitor?

Since modern PCs can use two screens at the same time I wonder if it is possible to plug in two keyboards and mouses as well to have the two screens run two (more or less) independent X-sessions at ...
1
vote
2answers
733 views

How to check how many Oracle user sessions are running

I need to check how many users are connected to server for specific applications through a browser. I'm mainly interested in Oracle. My server runs RHEL.
1
vote
1answer
2k views

Trouble adding existing user to existing group in ubuntu

I was trying to add a user called bill to www group useradd -G www bill It gives me error UX: useradd: ERROR: bill is already in use. Choose another. I checked if this user already in the group ...
2
votes
1answer
174 views

Does each user get his/her own tty(s)?

I put a simple echo command in a CLI tty by user1 expecting it to reach user2 who is logged in a separate tty. echo "Hello, world!" >> /dev/tty5 I expected user2 to get the echo message but ...
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 ...
3
votes
0answers
517 views

recommended procedure to create a user/group during RPM install

after trying hard to search for RPM best practices guides and finding virtually none, to my surprise, I resort to the community - I need to ensure that some users and groups exist after the ...
4
votes
1answer
304 views

Linux: Current correct/recommended use of games-group?

What is currently considered the correct/recommended/best-practice use of the games-group... As a "device group" for game-ports and joy-sticks, unassociated with the games-user (except for being one ...
2
votes
1answer
183 views

Delete every users from a group

I search a clean way to delete every users from the 'sudo' group. On several distributions the user created during the installation process has sudo rights, I don't want this. I search for an ...
1
vote
1answer
324 views

Can I export an NFS share with faked root privileges

I'm writing software for an embedded linux system and I'm using an NFS share as root directory. The root filesystem resides in /srv/nfs/rootfs, and it is exported using the following /etc/exports: ...
3
votes
2answers
177 views

Unix command to find files read by specific user

I would like to find files accessed by specific user (even just read) within a folder tree. I thought the find command had this option, but it actually just searches for owner user. Is there any other ...
0
votes
2answers
123 views

Change/Create permissions for a folder

How can I create (if the folder is new) or change (if the folder was already existent) permissions for a folder? In particular, I want to create a subdirectory in /etc/bind/ where I can put the ...
1
vote
2answers
981 views

Get a list of users with access to the host

I tried to go into /home and list all the subdirectories but it seems that all dirs that are not mine are hidden. I also tried cat /etc/passwd but that didn't list my very own ID I was logged in ...
2
votes
1answer
966 views

How to change the username in Ubuntu 10.10?

I want to change a username. In the prompt, which says abhishek@hello$, I want to replace abhishek with alok (i.e. alok@hello$). Is it possible to do that without reinstalling Ubuntu?
1
vote
1answer
378 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
398 views

Unix executable file permission vs runtime user's permissions

I have heard that it is good practice to run an executable as a user with a completely different privilege set than the owner of the task. In fact I heard that it is best to run it as a different user ...