Users and Groups

# chage -E 2005-12-31 user1

set deadline for user password [man]

# groupadd [group]

create a new group [man]

# groupdel [group]

delete a group [man]

# groupmod -n moon sun

rename a group from moon to sun [man]

# grpck

check correct syntax and file format of '/etc/group' and groups existence [man]

# newgrp - [group]

log into a new group to change default group of newly created files [man]

# passwd

change password [man]

# passwd user1

change a user password (only by root) [man]

# pwck

check correct syntax and file format of '/etc/passwd' and users existence [man]

# useradd -c "User Linux" -g admin -d /home/user1 -s /bin/bash user1

create a new user "user1" belongs "admin" group [man]

# useradd user1

create a new user [man]

# userdel -r user1

delete a user ( '-r' eliminates home directory) [man]

# usermod -c "User FTP" -g system -d /ftp/user1 -s /bin/nologin user1

change user attributes as description, group and other [man]