how to change user in shell

i login as userA
in a shell X, i want to run shell Y in name of userB,
i know both password of userA and userB
how can i do it?
thanks!

.

Follow-Ups:
- Re: how to change user in shell
  - From: Janis Papanagnou

Relevant Pages

Re: Simultaneous Users - Remote Connection and Desktop User
... I connect from another machine to my computer using UserA login. ... with UserB login, my UserA connection is dropped off. ... concurrent connection - period, local and/or remote. ...
(microsoft.public.windowsxp.work_remotely)
Re: how to change user in shell
... in a shell X, i want to run shell Y in name of userB, ... You wrote "I know both password of userA and userB." ... security, the password must not be compromised. ...
(comp.unix.shell)
Re: how to change user in shell
... in a shell X, i want to run shell Y in name of userB, ... You wrote "I know both password of userA and userB." ... security, the password must not be compromised. ...
(comp.unix.shell)
Re: how to change user in shell
... in a shell X, i want to run shell Y in name of userB, ... To leave the su command type exit. ... You wrote "I know both password of userA and userB." ...
(comp.unix.shell)
Re: how to change user in shell
... in a shell X, i want to run shell Y in name of userB, ... To leave the su command type exit. ... You wrote "I know both password of userA and userB." ...
(comp.unix.shell)