csh,ksh,bash,Bourne . The most commonly used and advanced shell used today is “Bash” .
How can any user find out all information about a specific user like his default shell, real life name, default directory,when and how long he has been using the sytem?
finger “loginName” …where loginName is the login name of the user whose information is expected.
We can use telnet to do this: telnet hostname –l user >Enter password >Write the command to execute >quit