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chsh command

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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FreeBSD: Install zsh Shell

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

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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OpenBSD Install BASH Shell Package Command

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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