chsh command

I am porting ksh script from Sun/Oracle Unix to Linux. How do I install ksh (KornShell) in CentOS / Fedora / Red Hat Enterprise Linux? How do I run and test ksh script on RHEL/CentOS Linux?

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How do I install the Z shell ( zsh ) shell under FreeBSD 9 operating systems?

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I am porting ksh script from Sun/Oracle Unix to Debian / Ubuntu Linux based server hosted on AWS cloud. How do I install ksh (KornShell) in Debian or Ubuntu Linux server? How do I run and test ksh scripts?

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I‘d like to Bash shell under FreeBSD for bash programming. How do I install bash shell under FreeBSD UNIX operating system?

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How do I install BASH shell package under OpenBSD operating system? How do I set bash as a default login shell under OpenBSD?

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