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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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UNIX: Loop Through Files In A Directory

How do I loop through files in a directory under UNIX like operating systems?
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HowTo: Unix For Loop 1 to 100 Numbers

I want to run a Unix command 100 times using a for loop from 1 to 100. Can you tell me how to take a block of numbers in a loop under KSH or BASH shell?
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