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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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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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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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Alarm clock: How To Set Timeout For A Shell Command

Q. How can I run a command called foo, and have it timeout / abort after 10 seconds under GNU/Linux running bash shell or script? How do I run command under an alarm clock?
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FreeBSD csh / tcsh: Export Shell Variable

Q. I'm using FreeBSD 7 with csh (tcsh) shell. How do I export 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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