Linux / UNIX: Change Bash To KSH Shell

How do I change my current login shell from bash to ksh under Linux or UNIX or Apple OS X operating systems?
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UNIX / Linux: Kill All My Jobs Under Current Shell Session

How do I kill all the UNIX jobs I created under my current login shell such as Bash or KSH before logout?
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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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Ubuntu Set User Profile Under Bash Shell

How do I set user profile under bash shell running Ubuntu Linux operating systems?
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FreeBSD csh / tcsh – Export Shell Variable

I am using FreeBSD version 7.x/8.x/9.x/10.x/11.x/12.x with csh (c shell) or tcsh. How do I export tcsh/csh shell variable under FreeBSD operating systems?
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Solaris UNIX: Change Default Shell

How do I change default ksh shell to bash shell under Solaris / OpenSolaris UNIX operating system using command line options?
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Download and Install csh / tcsh shell on Linux

Cshell is a shell (command interpreter) with C-like syntax. How do I download and install csh shell on a Linux operating system? How can I install csh on a Fedora/RHEL/CentOS Linux server? How do I install tcsh or csh on a Debian or Ubuntu Linux desktop?
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login shell