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Review of ksh powered by the Slant community.
KornShell (ksh) is a Unix shell. KornShell is backward-compatible with the Bourne shell and includes many features of the C shell, inspired by the requests of Bell Labs users.
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Pros
Pro It's a de facto standard
ksh comes from Bill Joy, in the days before Bash, and it's also native to Solaris so you should always write your scripts to support this shell.