Table of Contents
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Users and groups
| Name | Description | Remark |
|---|---|---|
| w | Show who is logged on and what they are doing | |
| wall | Write a message to all users logged in on a terminal | In a tmux session only users logged on that tmux session get the message |
| who | Show who is logged on |
User and Group management commands
For the change of adding a user to, or removing a user from, a group to have effect the user must log out and login again
| Name | Description | Remark |
|---|---|---|
| chfn | change real user name and information. The chfn command changes user fullname, office room number, office phone number, and home phone number information for a user's account | |
| groups | Print the groups a user is in | |
| groupadd | Create a new group | groupadd somenewgroupname |
| users | Print the user names of users currently logged in to the current host | |
| adduser | Create a new user | To add an existing user to a group use adduser user group |
| deluser | Remove a group for a user | deluser user group |
| gpasswd | Remove a group for a user | gpasswd --delete user group |
| usermod | Modify a user account | Incorporate all already enlisted groups and the group(s) to be added. Example : usermod --groups group1,group2,group3,newgroup user or use --append. Example: usermod --groups groupname --append user which does the same as usermod -G groupname -a user |
| vigr | Edit the groups file | |
| vipw | Edit the passwords file |
Ownership
With chmod the ownership of a file or directory can be changed. Multiple files and directories can be changed with chmod -R
WARNING: Hidden files have to be changed separately.
Example to change all files and directories (watch the dot in the second line!)
chown -R user2:user2 * cbown -R user2:user2 .*
user2 can be the name of the user account or the number of the user account
To be solved
As root:
# usermod -G adm -a user # grep user /etc/group adm:x:4:user user:x:1000: # ls -l /var/log/syslog -rw-r----- 1 root adm 2,1M okt 7 12:50 /var/log/syslog
As user user
$ less /var/log/syslog /var/log/syslog: Permission denied
Why denied if user is member of group adm?
Useful links
Debian System Groups
Standard groups
Users and groups
Managing Group Access
Linux users and groups
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