All about Unix groups and access control.

learn more… | top users | synonyms

-2
votes
0answers
41 views

Longest/shortest Username in linux

I'm trying to configure a script that displays all the users on the computer, the groups they belong to, and the shortest/longest usernames. I have the first part set up with the users and groups but ...
2
votes
1answer
34 views

Difference between adding sudo user with adduser or gpasswd

To add a new sudo user I believe I can call: # to create a new user sudo adduser newusername and to allow this user to use sudo I can do: sudo adduser newusername sudo or sudo gpasswd -a ...
1
vote
2answers
66 views

How to show all registred users and their groups with one command?

I was writing a test on basic Unix commands etc, and there was a question show all registered users and their groups with one command. At the same time I can't use getent command.
7
votes
4answers
275 views

Setting multiple groups as directory owners

On my server I have directory /srv/svn. Is it possible to set this directory to have multiple group ownerships, for instance devFirmA, devFirmB and devFirmC? The point is, I want to subversion ...
3
votes
2answers
882 views

group option in fstab not working

I'm trying to take advantage of the "group" option for fstab entries and not having any success. From the mount man page: Normally, only the superuser can mount filesystems. However, when fstab ...
2
votes
2answers
234 views

AT&T UNIX System V Release 4 - How do I create a new “Administrator” user?

I am running AT&T UNIX System V Release 4 Version 2.1 inside VirtualBox, and want to create a new "user account" for myself. At first, I simply created a new user with the useradd command, but ...
-1
votes
0answers
18 views

Why doesn't my new group show up when using `groups` [duplicate]

I just added a group with sudo groupadd group1. I then added myself (user1) to it by sudo useradd -G group1 user1. However, when I run groups, I don't see group1 as a listed group. I do, however, see ...
2
votes
1answer
11k views

Error message id: cannot find name for group ID after logging in

BACKGROUND Trevor logs into his account on ssh://foobar.university.edu as one of the developers on the box, and he gets the message: id: cannot find name for group ID 131 Trevor then checks this ...
0
votes
1answer
37 views

Prompting for a password on sudo?

I'm creating users using Puppet. Here's the gist of what I'm doing in Puppet: user { 'ntkay': name => 'ntkay', uid => 10000, home => '/home/ntkay', managehome => true, ...
1
vote
2answers
41 views

dialout group missing

I have debian8, (Jessie) and I am trying to add a user to the dialout group. Alas, that group doesn't exist. I would prefer not to add the user to the root or sudo group. what should I do? ~$ ...
2
votes
2answers
45 views

File owner changes after editing a group editable file

I use archlinux x64. I'm studying web development and in order to edit files served by Apache under srv/http, directory which Apache serves, I created a group adding my user and Apache's user so I ...
3
votes
2answers
252 views
0
votes
1answer
25 views

Is there any way of knowing who [including remote users] can access a paticular file / folder?

In Windows you could enter file properties and see which users have an access to a patricular files. [Including remote users / groups that are part of your domain] In unix when you enter properties ...
2
votes
1answer
656 views

how to make logstash read kannel log

I got logstash installed on ubuntu 12.04 using the apt repository. But logstash is not reading any document. In logstash log there are the following: ...
2
votes
1answer
65 views

Linux user groups and file system permissions

Assume I have groups G1, and G2, and user U. User U is a member of both groups, but G1 is it's primary group. In my file system there is a folder F which is accessible by G2. Now if U wants to ...
1
vote
1answer
12 views

How to only allow a group for network access?

Using OpenBSD's pf. Question: How can we modify the firewall of OpenBSD to allow ONLY a given group for network access? If somebody isn't in that group, it shouldn't have layer 3 or layer 2 network ...
1
vote
2answers
59 views

how to list users in a group and their passwords

How do I view a list of users in a specific group and their passwords or attributes? I know to use cut -d: -f1 /etc/passwd But this only lists users.
1
vote
1answer
32 views

which command will give complete user creation in RHEL?

I want to create a user in RHEL 6.5 and i have three commands (1)useradd (2)adduser (3)system-config-users which one will give the complete user creation.
1
vote
1answer
41 views

How to give user access to specific folder in home directory

I'm trying to set up a 'deploy' user on my VPS (running CentOS 6 and cPanel) which needs to have access to a specific folder from another home directory: /home/nazeem/public_html/staging. I've ...
4
votes
1answer
119 views

Adding a system user to an LDAP group with SSSD

Our LDAP server is running RFC 2307 groups (memberuid contains a username, not a DN). With our old nscd/nss_ldap/pam_ldap setup, you could list a non-LDAP user (a system user from /etc/passwd) in an ...
0
votes
1answer
26 views

Relationship between file properties and user and group

There is something not clear on relationship between file properties and user and group. root@debian:/home/debian# ls -l /home/linuxsir total 4 -rw-r--r-- 1 linuxsir root 1549 Feb 23 19:16 ...
1
vote
2answers
23 views

recommended storage location for multiple users [duplicate]

Is there a conventional location to store non-secret bulk files that can be accessible by multiple users? I know that I can create a new folder (and set the right permissions) in most places in the ...
-1
votes
1answer
31 views

why there are only 3 elements in my /etc/file? [closed]

My system is debian 7.8. It is said that there are four elements on /etc/group file , group_name Password Group ID (GID): Group List: Why are there are only three elements in my /etc/group file ...
20
votes
2answers
50k 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 ...
3
votes
2answers
483 views

What is nobody nobody user and group?

On my server (Synology DS212) some files and folders have nobody nobody users and groups. What are the characteristics of this user and group? Who can write of read this file? How can I change it ? ...
6
votes
2answers
668 views

groupadd failure while writing changes to /etc/group

I have been following this guide on installing debian-kit on my Sony Xperia Tablet Z and the installation goes fine until I try to apt-get install andromize which fails with the error groupadd: ...
2
votes
1answer
10k views

Changing user and group ID system wide (including file system attributes)?

(this question possibly related to Linux: simulating/masking user ownership upon mount of 'external' partitions? - Stack Overflow) I typically use Ubuntu (currently 11.04) as my desktop OS; let's say ...
0
votes
1answer
43 views

How to add “sudo” group

I've done a mistake: I've removed the 'sudo' group, because I have forgotten the -a option (I wanted to add 'video' group): sudo usermod -G video $USER Now, when I want to call sudo I have this ...
0
votes
3answers
176 views

How to add group to a user without removing other group in suse linux with usermod?

I have one user, which has one primary group & one secondary group, like: [ testuser Welcome ~ ]$ id uid=2000(testuser) gid=2000(testuser) groups=2000(testuser),27(sudo),2001(testgroup) ...
90
votes
7answers
131k views

How do I remove a user from a group?

Which command should I use to remove a user from a group in Debian? When adding a user to a group, it can be done with: usermod -a -G group user However, I could not find a similar command ...
1
vote
1answer
60 views

Group member cannot list files in directory made by group

I am using Centos 6.6. I made a group with the following call sudo groupadd www-OtagoHarbour sudo usermod -G www-OtagoHarbour apache sudo usermod -G www-OtagoHarbour OtagoHarbour When I enter ...
0
votes
1answer
36 views

Sudoers - group managing and reboot/shutdown

I've got a group (let's say name "group1", ID = 1234) and a user (let's say name "user1", ID="4321"). I want to do two things: I want that user to change passwords from other members of that group, ...
1
vote
1answer
32 views

What if I add a user to a supplementary group?

I am using debian 7.0 and I added "debian-transmission" to the group "pi" with: usermod -a -G pi debian-transmission I made this change because transmission was not able to write the pi mounted ...
5
votes
2answers
10k views

How do i extend a partition with a LVM and the contained physical volume and logical volume?

On my 240 GB SSD i had at first two partitions, one containing the Logical Volume with Linux Mint and the other had contained a NTFS partition to share with Windows. Now i removed the NTFS partition ...
1
vote
0answers
18 views

give group permissions to specific device

I have a panning web camera I built, (future robot arm). The camera pans via a web interface (cgi scripts and JS interface) which access an arduino. To enable sending of commands via the interface, I ...
2
votes
1answer
57 views

Different write behavior for owner and member of group despite 775 permissions

I have mounted a remote share via my fstab using the line: //path/to/target /media/f cifs gid=<mygroup's id>,dir_mode=0775,file_mode=0775 0 0 As a result, everything under /media/f winds up ...
1
vote
2answers
37 views

Give group the right to send kill signals

I have a process that a user1 runs. And I need to grant all the group members the right to send some kill signal to it. So far, I always get this output: myProcess(13919): Operation not permitted ...
1
vote
0answers
31 views

How can I set a group policy to all access on all folders except one?

I am currently making a test environment where users will be going through a network administration course with different levels they must complete. Due to the nature of the course, we want to give ...
8
votes
2answers
5k views

Group member cannot write even with write permission

The logged in user is a member of a group that has a write permission on a folder. But when this user is trying to write something, "permission is denied". The log below summarizes the question: ...
1
vote
0answers
53 views

Unable to access a directory despite belonging to a group with write permission [duplicate]

I am learning basic file permission in Linux and tried actions below. I have a folder "music" to which group "music" has wxr permission. I have user "finxxi" added into group "music". When user ...
2
votes
1answer
54 views

Do root's supplementary groups behave differently than regular account ones for NFS shares?

OS: Linux CentOS 7, NFSv4 On one machine I exported an NFS share group-owned by the nfsgroup with 2770 privileges for group collaboration: groupadd -g 5000 nfsgroup chown nobody:nfsgroup ...
1
vote
1answer
49 views

sudoers file and passwd only for selected group

I have 3 users in "production" group: John, Steve and Bob. In "sales" group are: Sam and Jack. Now, I would like to give John permition to change passwords of all users but only in "production" ...
1
vote
1answer
36 views

User cannot access a file after setting an ACL [duplicate]

I cannot enter a directory after creation in a folder with an ACL: I am attempting to limit rwx access to a folder for just a single group and no one else. I would like to be able to add new users to ...
2
votes
1answer
343 views

Creating users with groups in Ubuntu Server? [closed]

Typically when I create a new user in CentOS / Redhat with the command: useradd user The permissions that it is assigned to the user typically works fine. I believe everything is restricted to its ...
0
votes
2answers
174 views

Automatically set group and permissions on files in a folder? [duplicate]

When I create new files and folders in a specific folder, I would like them to inherit the group and permissions of the parent folder. Is this possible ? For example mkdir -p example.com/public cd ...
2
votes
3answers
3k views

CentOS can't remove user from group

Asked and answered many times, but I can't get it working!!! (On CentOS) I have the user userA and I want to remove it from group sftponly. #groups userA userA : sftponly #id -Gn userA sftponly ...
1
vote
1answer
63 views

Given a domain-controlled group, how can I get its domain?

I'm working on an application which collects data on groups. In my application I need to collect data and the residing users of local groups and send meta-data on domain-controlled groups. My ...
1
vote
2answers
390 views

Remove group ID from user

How can I remove a group (which was previously deleted) from a user which still references it? If I run groups, I get an error about a non-existent group: $ groups myuser dialout cdrom sudo dip ...
0
votes
1answer
250 views

What has priority - owner/user vs group permission? [duplicate]

I have just run into the case in which the owner-group of a file has more permissions than the owner-user of a file. user1@pc:/tmp$ ls testfile -l ----rw---- 1 user1 user1 9 Okt 16 13:16 testfile ...
4
votes
2answers
327 views

Precedence of user and group owner in file permissions

I just ran into something unexpected (for me) regarding file permissions on Linux (Arch Linux). Basically I have: userX in groupX fileX userX:groupX ---rwx---- What puzzles me: I cannot perform ...