korn shell

How do I check ksh version? How do I find out ksh version under UNIX like operating systems?

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What is /bin/dash? I noticed that the default system shell /bin/sh was changed to /bin/dash. Why was this change made?

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How do I read a file line by line using KSH shell scripting under UNIX like operating systems?

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What is POSIX Shell under UNIX / Linux operating systems?

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