Showing posts with label User Management. Show all posts
Showing posts with label User Management. Show all posts

Sunday, April 5, 2015

Linux User Management



ac

Print statistics about users' connect time.
accton

Turn on accounting of processes. To turn it on type "accton /var/log/pacct".
adduser

Ex: adduser mark - Effect: Adds a user to the system named mark
chage

Used to change the time the user's password will expire.
chfn

Change the user full name field finger information
chgrp

Changes the group ownership of files.
chown

Change the owner of file(s ) to another user.
chpasswd

Update password file in batch.
chroot

Run command or interactive shell with special root directory.
chsh

Change the login shell.
edquota

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.
faillog

Examine faillog and set login failure limits.
finger

See what users are running on a system.
gpasswd

Administer the /etc/group file.
groupadd

Create a new group.
grpck

Verify the integrity of group files.
grpconv

Creates /etc/gshadow from the file /etc/group which converts to shadow passwords.
grpunconv

Uses the files /etc/passwd and /etc/shadow to create /etc/passwd, then deletes /etc/shadow which converts from shadow passwords.
groupdel

Delete a group.
groupmod

Modify a group.
groups

Print the groups a user is in
id

Print real and effective user id and group ids.
last

Display the last users logged on and how long.
lastb

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.
lastcomm

Display information about previous commands in reverse order. Works only if process accounting is on.
lastlog

Formats and prints the contents of the last login.
logname

Print user's login name.
newgrp

Lets a suer log in to a new group.
newusers

Update and create newusers in batch.
passwd

Set a user's pass word.
pwck

Verify integrity of password files.
pwconv

Convert to and from shadow passwords and groups.
quota

Display users' limits and current disk usage.
quotaoff

Turns system quotas off.
quotaon

Turns system quotas on.
quotacheck

Used to check a filesystem for usage, and update the quota.user file.
repquota

Lists a summary of quota information on filesystems.
sa

Generates a summary of information about users' processes that are stored in the /var/log/pacct file.
smbclient

Works similar to an ftp client enabling the user to transfer files to and from a windows based computer.
smbmount

Allows a shared directory on a windows machine to be mounted on the Linux machine.
smbpasswd

Program to change users passwords for samba.
su

Ex: su mark - Effect: changes the user to mark, If not root will need marks password.
sulogin

Single user login.
ulimit

A bash builtin command for setting the processes a user can run.
useradd

Create a new user or update default new user information.
userdel

Delete a user account and related files.
usermod

Modify a user account.
users

Print the user names of users currently logged in.
utmpdump

Used for debugging.
vigr

Edit the password or group files.
vipw

Edit the password or group files.
w

Display users logged in and what they are doing.
wall

Send a message to everybody's terminal.
who

Display the users logged in.
whoami

Print effective user id.