user del mod etc..

Display list of shell
Code:
less  /etc/shells
cat  /etc/shells
more /etc/shells
Change the user login shell to /bin/ksh for foo user
Code:
chsh -s /bin/ksh foo
chsh -s /bin/bash username

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Adding user
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Syntax: # useradd -s <SHELL> -m -d <HomeDir> -g <Group> UserName


-s SHELL : Login shell for the user.
-m : Create user’s home directory if it does not exist.
-d HomeDir : Home directory of the user.
-g Group : Group name or number of the user.
UserName : Login id of the user.

Create Linux User with Custom Configurations Using useradd Command
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The following example creates an account (lebron) with home directory /home/king, default shell as /bin/csh and with comment “LeBron James”.

# useradd -s /bin/csh -m -d /home/king -c "LeBron James" -g root lebron

# grep lebron /etc/passwd

lebron:x:513:0:LeBron James:/home/king:/bin/csh
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Verify user information:
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# finger david

Output:

Login: david                      Name: david gilmour
Directory: /iscsi/user/vivek                Shell: /bin/bash
Last login Thu Sep 13 07:58 2007 (IST) on pts/1 from 10.16.15.2
No mail.
No Plan.
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You can use the usermod command. The following (run as root) will change the user smith's 
home directory to /tmp/smith and move all of their files with it.

Code:
usermod -m -d   /tmp/smith smith

Add an Existing User to a Group

Next we’ll add a user to the group, using this syntax:

usermod -a -G <groupname> username

eg. usermod -a -G dockergroup  stackuser