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A Practical Guide to Red Hat® Linux® 8 by Mark G. Sobell

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The Z Shell, Korn Shell, and Pd-ksh

Although a complete version of the Korn Shell is now available as a commercial product for use with GNU/Linux, most users of the Korn Shell have relied on a public domain implementation named Pd-ksh (for Public Domain ksh; the name of the program is pdksh). Although pdksh (www.cs.mun.ca/~michael/pdksh) provides most of the basic features of the Korn Shell, it is missing some of the more advanced features that make the Korn Shell a powerful language for writing shell scripts. Most of these features (and then some) are present in zsh. In fact, if the Z Shell is linked to the filename /bin/ksh, running /bin/ksh results in the Z Shell starting with a default configuration that closely resembles the Korn Shell. ...

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