All about Unix groups and access control.

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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.
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3answers
122 views

group file and everything related to it [closed]

I'm quite new to *nix OS. I understand the format and usage (at least what the man pages says) of the /etc/group file. One day I was trying to replace my group file with a backup copy. I changed the ...
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2answers
1k views

How to handle user permission issue?

We have created an asset management application web app using php. This app allows users to browse, upload, rename, replace assets (binary files like images and 3d models) We developed in windows ...
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2answers
2k views

newgrp and groups assigned via pam_group.so

For convenience reasons I tend to assign special group memberships like floppy, audio, plugdev, video etc. via /etc/security/group.conf (pam_group.so) mechanism instead of adding all users to this ...
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3answers
49 views

Predefined group ids across Linux distros?

In order to successfully implement w/r access via ACL for external storage with ext4 fs I need to assign default group id for files on storage. LSB_5.0.0 say: This specification makes no attempt to ...
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79 views

How to switch a group without asking for a password?

In linux, there's two files where group definitions are specified. One of them is /etc/group and the other is /etc/gshadow. I want my regular user to be able to switch a group while starting a process ...
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390 views

groupadd: group 'terminal' already exists in Linux

I have created a group called "terminal" using groupadd terminal and when I list out the groups using groups command it will not show the newly created group name in the output but if I add the same ...
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3answers
45 views

If I delete groups, are users in those groups deleted?

I use ubuntu 14.04 and made 120 users. 115 users are in "student" and 5 users are in "assistant". If I delete groups, then are users in those groups deleted too?
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128 views

How To Logout and Apply New Group Settings [duplicate]

Can someone please tell me how to logout and log back in again via the command line so that I can apply a new group's settings to a user. To put this in perspective, assume that I am currently logged ...
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1answer
125 views

List of group id actually used on Debian

How can I get a list of group id which are currently used for Debian OS. I know that e.g. 0-99 are reservered for Debian "intern" things, but I'm wondering which ID is used for which group inside this ...
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429 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 ...
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2answers
407 views

Command to know privileges of a user group

If I run cat /etc/group command or groups username I am able to know the list of groups as group of a particular user. Is there any command through which I could know which type of privileges a ...
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94 views

Putting two accounts in group not giving read access to group members

I have an Apache based web site and am trying to allow the user to upload files to a drop box on one machine and then have them transferred to another. So I form a group for two users: www-data which ...
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1answer
2k views

delete user from group in fedora from command line

I have been using ubuntu extensively and use the following from the command line: deluser <username> <groupname> It doesn't seem to work in fedora. Is there an equivalent?
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2answers
1k views

Can't change group of files on mount point

I have mounted some ntfs drives. /etc/fstab looks like this: /dev/mapper/fedora-root / ext4 defaults 1 1 UUID=b6603ac8-e004-4cd6-b141-9bc95409e32a /boot ...
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591 views

Modify Default Group for new Users in Solaris 11

I would like to change the default group for new users which are added to the system. Does anybody know in which file this is stored? I'm using Solaris 11
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1answer
560 views

Group permissions ineffective, permission still denied

I've got a problem with UNIX permissions : I'm working under Debian Squeeze, and one of my scripts, run by www-data, needs to move a file, 23550.zip, placed in the home directory of another user, ...
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1answer
23 views

Linux, having trouble adding user to second group

Redhat Linux 5.10 (Tikanga) I'm trying to add an existing user to a second group. The user is already part of the primary group called "prim" and the secondary group I want to add him to is "sec". ...
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5answers
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Show a user exists command

Is there a command that shows a user exists and is assigned to a group? I have just used the command usermod -a -G [GROUP] [NAME OF USER] and assigned a user to a group but, I was wondering if there ...
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3answers
62 views

File System Permissions: User who can backup all files

I am setting up an automated backup job for some computers on my network. There is a server that will, daily, run an rsync command to backup each of the other computers. I'd like the user that the ...
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1answer
26 views

Group Directory permission

you have been asked by couple of programmers to make ProjectA a group directory on a UNIX server which allows them to create files under that directory to facilitate collaborative work, but only the ...
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1answer
58 views

Unable to execute program without root privileges regardless of group or permissions

avrdude is a simple tool that allows downloading of a program to a target microcontroller. For completeness, the command I am trying to issue is: avrdude -p atmega328p -c usbtiny -P usb -v -U ...
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1answer
254 views

Linux Root group change chmod for root owned to 770

I'd like to have normal user account assigned to root group (which I've done already) and change mod of all files that are owned by root user to 770, If I understood it well in result of that every ...
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2answers
192 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.
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2answers
77 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 ...
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2answers
2k 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 ...
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1answer
75 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 ...
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93 views

Find files belonging to a group

Actually I want to find all the files and folders that are under the same group, for example I have this : [test] user1/sam a.txt user9/sam b.txt user4/sam I'm looking for a command ...
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433 views

Where is core group defined on coreos?

On CoreOS EC2 instance, I find the following: $ cat /etc/passwd root:x:0:0:root:/root:/bin/bash core:x:500:500:CoreOS Admin:/home/core:/bin/bash $ cat /etc/group wheel:x:10:root,core sudo:x:150: ...
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726 views

how to determine the permissions of groups?

When you invoke sudo, it prompts for password and then checks the /etc/sudoers configuration file to see if the user is permitted access to run the command. /etc/sudoers is the sudo configuration ...
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1answer
863 views

Granting permission for all users in a group to write to a directory and all its subdirectories

Trying out Linode for the first time, running an Arch Linux image, I successfully installed nginx as root. This, however, made /usr/share/nginx/html inaccessible to non-root users. Intuitively, I ...
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1answer
590 views

Several groups can have the same groupID?

0:root@SERVER:/root # grep 300 /etc/group ipsec:!:300:admgrp 0:root@SERVER:/root # ?? Several groups (ipsec/admgrp) can have the same groupID (300)?? how can this be? /AIX 6.1/
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292 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 ...
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1answer
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Significance of groups assigned to user by Debian installer (only)?

I want to remove my default user from the sudo group. IOW I want to change it to an unprivileged account. However it also seems to be a member of ten other system groups. What is the overall ...
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28 views

Where does Linux track who is a group admin through the gpasswd command?

If I modify group membership and admins using the gpasswd command and add a user as a group admin Linux will allow that user to perform tasks otherwise reserved by root. Ex. [test1@centos ~]$ ...
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21 views

How to avoid that Geany editor changes owner of file when it's edited?

I use Geany to edit files in a web app that resides in /var/www. The owner and group of /var/www and all sub directories and files are www-data:www-data. My user account is a member of that group and ...
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89 views

logrotate fails to rotate logs: error setting owner

Recently I've noticed that logrotate does not rotate my logs. user1@host:~$ /usr/sbin/logrotate /home/user1/logrotate.conf -v gives me an error: error: error setting owner of /home/logs/mylog.log.1 ...
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87 views

How to add users to Linux through a shell script

The shell script that I have to write has to create new users and automatically assign them to groups. This is my code so far: echo -n "Enter the username: " read text useradd $text I was able to ...
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100 views

Add multiple user to UNIX group in one line

On Centos 6.5 (and probably any) linux, I can create a group: sudo groupadd mygroup and add several users to it: sudo usermod -a -G mygroup userA sudo usermod -a -G mygroup userB sudo usermod -a ...
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83 views

group files into fixed-size chunks

Example: Say I have 20 000 images and I need to group them into folders in order to burn them to a CD (max 700MB / folder). General: I have N files and I need to group them into M groups, so that all ...
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1answer
110 views

Read file permission denied despite sufficient permissions [duplicate]

I'm attempting to cat a file with 770 permissions as a user who is part of the group (but not the owner of the file). This should provide sufficient permissions to my understanding, yet I encounter a ...
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1answer
64 views

directory permissions [closed]

I'm currently working on a PHP server explorer, and I have to determine if a directory is empty or not readable because of insufficient permission. My web application is running under the user ...
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2answers
501 views

Where & How is user group information stored in Ubuntu? [closed]

Two places possible: /etc/group and /etc/passwd. If I use command: adduser [username] [groupname], then the user would be added to the group, and the file /etc/group would then be updated. However, ...
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1answer
110 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, ...
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1answer
131 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 ...
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64 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 ...
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85 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" ...
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1answer
190 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 ...
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1answer
87 views

Groups in the Samba configuration

I can't quite understand groups. For example, lets say if I add the following into my samba config: valid users = @users Must the group users exist on my system or is a samba group itself? And if ...
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217 views

Re-add accidently deleted system group

In my attempt to delete the admin user group I accidentally deleted the adm system group. I "added it back" by issuing addgroup --system adm. I have a feeling this is going to bite me back later. Is ...