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CentOS / RHEL: Install KornShell (KSH)

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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Debian / Ubuntu Linux: Install KornShell (KSH)

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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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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