rh135-day15.pdf

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RH135-Day15

Written by Razib Shahriar Rubence

Managing User Accounts:

local users information are stored in a simple file /etc/passwd. Students are advised to follow

page 107 and 108 for detail.

Command to manage users:

# useradd username <-- to add users

# passwd username <-- to change the password of user

# userdel -rf username <-- to delete user with recursively removing their home and mail

directory

# id username <-- Shows user's id

# usermod is used to modify user's information. Some important uses of usermod is as follows:

# usermod -D directoryname username <-- change user's home directory

# usermod -S filename username <--- change user's login shell

# usermod -G Groupname username <-- assign Groupname as supplementary Group of the

user

# usermod -L username <--- Locking user account

# usermod -U username <--- To unlock user account

Managing Password:

Password Aging Policies

By default passwords do not expires. To modify password aging for existing users, use the

chage command

# chage [options] username

-m minimum days between password changes from last change date

-M Maximum days between password changes from last change date

-I Number of days inactive since password expired before locking account

-E Date expire the account on this date (YYYY-MM-DD format)

-W Number of days before a required change to start warnings

-l List of settings

-d Force users to change their password when first loging

LAB Practice:

For the user jack implement the following password aging policy:

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RH135-Day15

Written by Razib Shahriar Rubence

01. Account will be expired on Dec 31st, 2011

02. Password must be changed within 30 days of last password change

03. If password doesn't change within 30days of last password change, the account will be

inactive for next 7 days.

# change -E 2011-12-31 -M 30 -I 7 jack

# chage -l jack

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