Bacchas at 17:49, 9 March 2018

2018-03-09T17:49:19Z

← Older revision		Revision as of 17:49, 9 March 2018
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	== Linux User management ==		== Linux User management ==
			=== Force Xorg login===
			force gui to start in xorg as opposed to wayland
			you need this in order use teamviewer
			edit /etc/gdm3/custom.conf
			uncomment WaylandEnable=false

	=== Add A New User To Secondary Group===		=== Add A New User To Secondary Group===

Bacchas at 13:47, 17 August 2016

2016-08-17T13:47:41Z

← Older revision		Revision as of 13:47, 17 August 2016
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	</table>		</table>
			----
			==[[#Linux User management\|Back To Top]]-[[Main_Page\| Home]] - [[Ubuntu_Tips\|Category]]==

Bacchas: /* list all users in a group: */

2016-08-17T13:45:37Z

list all users in a group:

← Older revision		Revision as of 13:45, 17 August 2016
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	compgen -u		compgen -u

	=== List all groups: ===		=== List all groups: ===
	compgen -g		compgen -g

Bacchas at 13:45, 17 August 2016

2016-08-17T13:45:18Z

← Older revision		Revision as of 13:45, 17 August 2016
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	=== Change existing user tony primary group to www: ===		=== Change existing user tony primary group to www: ===

	~~<pre>~~# usermod -g www tony~~</pre>~~		# usermod -g www tony

	=== list all users in a group: ===		=== list all users in a group: ===
	~~<pre>~~ compgen -u~~</pre>~~		compgen -u

	=== List all groups: ===		=== List all groups: ===
	~~<pre>~~ compgen -g~~</pre>~~		compgen -g

	=== See what groups a user belongs to: ===		=== See what groups a user belongs to: ===
	~~<pre>~~groups nameofuser~~</pre>~~		groups nameofuser

	<p>command to Show all users:<br /> cat /etc/passwd <br /> lastlog</p>		<p>command to Show all users:<br /> cat /etc/passwd <br /> lastlog</p>
	<table border="1" rules="ROWS">		<table border="1" rules="ROWS">

Bacchas: Created page with "== Linux User management == === Add A New User To Secondary Group===

 useradd Example -   You need to the useradd command to add new users to existing group (or create..."

2016-08-17T13:43:09Z

Created page with "== Linux User management == === Add A New User To Secondary Group=== <pre> useradd Example - You need to the useradd command to add new users to existing group (or create..."

New page

== Linux User management ==

=== Add A New User To Secondary Group===
<pre> useradd Example -

You need to the useradd command to add new users to existing group (or create a new group and then add user). If group does not exist, create it. The syntax is as follows:
useradd -G {group-name} username
</pre>

=== Add a new user to primary group ===

<pre>
useradd example -

To add a user tony to group developers use following command:

# useradd -g developers tony

# id tony
</pre>

=== Addding a group ===

<pre># groupadd developers
</pre>

=== Add user called vivek to group developers: ===
<pre>
# useradd -G developers vivek
</pre>

=== Setup password for user vivek: ===
<pre>
# passwd vivek</pre>

''' Please note that capital G (-G) option add user to a list of supplementary groups. Each group is separated from the next by a comma, with no intervening whitespace. For example, add user jerry to groups admins, ftp, www, and developers, enter: '''
<pre>
# useradd -G admins,ftp,www,developers jerry</pre>

''' Please note that small -g option add user to initial login group (primary group). The group name must exist. A group number must refer to an already existing group. '''

=== Add a existing user to existing group ===

<pre>
usermod example -
Add existing user tony to ftp supplementary/secondary group with usermod command using -a option ~ i.e. add the user to the supplemental group(s). Use only with -G option :

# usermod -a -G ftp tony
</pre>

=== Change existing user tony primary group to www: ===

<pre># usermod -g www tony</pre>

=== list all users in a group: ===
<pre> compgen -u</pre>

=== List all groups: ===
<pre> compgen -g</pre>

=== See what groups a user belongs to: ===
<pre>groups nameofuser</pre>
command to Show all users: cat /etc/passwd lastlog
<table border="1" rules="ROWS">
<tr>
<td>ac</td>
<td width="10"> </td>
<td>Print statistics about users' connect time.</td>
</tr>
<tr>
<td>accton</td>
<td width="10"> </td>
<td>Turn on accounting of processes. To turn it on type "accton /var/log/pacct".</td>
</tr>
<tr>
<td>adduser</td>
<td width="10"> </td>
<td>Ex: adduser mark - Effect: Adds a user to the system named mark</td>
</tr>
<tr>
<td>chage</td>
<td width="10"> </td>
<td>Used to change the time the user's password will expire.</td>
</tr>
<tr>
<td>chfn</td>
<td width="10"> </td>
<td>Change the user full name field finger information</td>
</tr>
<tr>
<td>chgrp</td>
<td width="10"> </td>
<td>Changes the group ownership of files.</td>
</tr>
<tr>
<td>chown</td>
<td width="10"> </td>
<td>Change the owner of file(s ) to another user.</td>
</tr>
<tr>
<td>chpasswd</td>
<td width="10"> </td>
<td>Update password file in batch.</td>
</tr>
<tr>
<td>chroot</td>
<td width="10"> </td>
<td>Run command or interactive shell with special root directory.</td>
</tr>
<tr>
<td>chsh</td>
<td width="10"> </td>
<td>Change the login shell.</td>
</tr>
<tr>
<td>edquota</td>
<td width="10"> </td>
<td>Used to edit user or group quotas. This program uses the vi editor to edit the quota.user and quota.group files. If the environment variable EDITOR is set to emacs, the emacs editor will be used. Type "export EDITOR=emacs" to set that variable.</td>
</tr>
<tr>
<td>faillog</td>
<td width="10"> </td>
<td>Examine faillog and set login failure limits.</td>
</tr>
<tr>
<td>finger</td>
<td width="10"> </td>
<td>See what users are running on a system.</td>
</tr>
<tr>
<td>gpasswd</td>
<td width="10"> </td>
<td>Administer the /etc/group file.</td>
</tr>
<tr>
<td>groupadd</td>
<td width="10"> </td>
<td>Create a new group.</td>
</tr>
<tr>
<td>grpck</td>
<td width="10"> </td>
<td>Verify the integrity of group files.</td>
</tr>
<tr>
<td>grpconv</td>
<td width="10"> </td>
<td>Creates /etc/gshadow from the file /etc/group which converts to shadow passwords.</td>
</tr>
<tr>
<td>grpunconv</td>
<td width="10"> </td>
<td>Uses the files /etc/passwd and /etc/shadow to create /etc/passwd, then deletes /etc/shadow which converts from shadow passwords.</td>
</tr>
<tr>
<td>groupdel</td>
<td width="10"> </td>
<td>Delete a group.</td>
</tr>
<tr>
<td>groupmod</td>
<td width="10"> </td>
<td>Modify a group.</td>
</tr>
<tr>
<td>groups</td>
<td width="10"> </td>
<td>Print the groups a user is in</td>
</tr>
<tr>
<td>id</td>
<td width="10"> </td>
<td>Print real and effective user id and group ids.</td>
</tr>
<tr>
<td>last</td>
<td width="10"> </td>
<td>Display the last users logged on and how long.</td>
</tr>
<tr>
<td>lastb</td>
<td width="10"> </td>
<td>Shows failed login attempts. This command requires the file /var/log/btmp to exist in order to work. Type "touch /var/log/btmp" to begin logging to this file.</td>
</tr>
<tr>
<td>lastcomm</td>
<td width="10"> </td>
<td>Display information about previous commands in reverse order. Works only if process accounting is on.</td>
</tr>
<tr>
<td>lastlog</td>
<td width="10"> </td>
<td>Formats and prints the contents of the last login.</td>
</tr>
<tr>
<td>logname</td>
<td width="10"> </td>
<td>Print user's login name.</td>
</tr>
<tr>
<td>newgrp</td>
<td width="10"> </td>
<td>Lets a suer log in to a new group.</td>
</tr>
<tr>
<td>newusers</td>
<td width="10"> </td>
<td>Update and create newusers in batch.</td>
</tr>
<tr>
<td>passwd</td>
<td width="10"> </td>
<td>Set a user's pass word.</td>
</tr>
<tr>
<td>pwck</td>
<td width="10"> </td>
<td>Verify integrity of password files.</td>
</tr>
<tr>
<td>pwconv</td>
<td width="10"> </td>
<td>Convert to and from shadow passwords and groups.</td>
</tr>
<tr>
<td>quota</td>
<td width="10"> </td>
<td>Display users' limits and current disk usage.</td>
</tr>
<tr>
<td>quotaoff</td>
<td width="10"> </td>
<td>Turns system quotas off.</td>
</tr>
<tr>
<td>quotaon</td>
<td width="10"> </td>
<td>Turns system quotas on.</td>
</tr>
<tr>
<td>quotacheck</td>
<td width="10"> </td>
<td>Used to check a filesystem for usage, and update the quota.user file.</td>
</tr>
<tr>
<td>repquota</td>
<td width="10"> </td>
<td>Lists a summary of quota information on filesystems.</td>
</tr>
<tr>
<td>sa</td>
<td width="10"> </td>
<td>Generates a summary of information about users' processes that are stored in the /var/log/pacct file.</td>
</tr>
<tr>
<td>smbclient</td>
<td width="10"> </td>
<td>Works similar to an ftp client enabling the user to transfer files to and from a windows based computer.</td>
</tr>
<tr>
<td>smbmount</td>
<td width="10"> </td>
<td>Allows a shared directory on a windows machine to be mounted on the Linux machine.</td>
</tr>
<tr>
<td>smbpasswd</td>
<td width="10"> </td>
<td>Program to change users passwords for samba.</td>
</tr>
<tr>
<td>su</td>
<td width="10"> </td>
<td>Ex: su mark - Effect: changes the user to mark, If not root will need marks password.</td>
</tr>
<tr>
<td>sulogin</td>
<td width="10"> </td>
<td>Single user login.</td>
</tr>
<tr>
<td>ulimit</td>
<td width="10"> </td>
<td>A bash builtin command for setting the processes a user can run.</td>
</tr>
<tr>
<td>useradd</td>
<td width="10"> </td>
<td>Create a new user or update default new user information.</td>
</tr>
<tr>
<td>userdel</td>
<td width="10"> </td>
<td>Delete a user account and related files.</td>
</tr>
<tr>
<td>usermod</td>
<td width="10"> </td>
<td>Modify a user account.</td>
</tr>
<tr>
<td>users</td>
<td width="10"> </td>
<td>Print the user names of users currently logged in.</td>
</tr>
<tr>
<td>utmpdump</td>
<td width="10"> </td>
<td>Used for debugging.</td>
</tr>
<tr>
<td>vigr</td>
<td width="10"> </td>
<td>Edit the password or group files.</td>
</tr>
<tr>
<td>vipw</td>
<td width="10"> </td>
<td>Edit the password or group files.</td>
</tr>
<tr>
<td>w</td>
<td width="10"> </td>
<td>Display users logged in and what they are doing.</td>
</tr>
<tr>
<td>wall</td>
<td width="10"> </td>
<td>Send a message to everybody's terminal.</td>
</tr>
<tr>
<td>who</td>
<td width="10"> </td>
<td>Display the users logged in.</td>
</tr>
<tr>
<td>whoami</td>
<td width="10"> </td>
<td>Print effective user id.</td>
</tr>

</table>

User Management - Revision history

Bacchas at 17:49, 9 March 2018

Bacchas at 13:47, 17 August 2016

Bacchas: /* list all users in a group: */

Bacchas at 13:45, 17 August 2016

Bacchas: Created page with "== Linux User management == === Add A New User To Secondary Group===
useradd Example - You need to the useradd command to add new users to existing group (or create..."