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Change Shell To Bash

How do I switch from a ksh shell to bash on Linux or Unix system? How to change shells on Unix-like system?
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Linux Disable Shell / FTP Access For a User Account

My users will only be checking mail, and I want to disable FTP access as well as shell access under CentOS Linux. How do I disable shell (SSH) and FTP access to a new or old user under Linux without deleting user account?
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