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Korn Shell: Unix and Linux Programming Manual, Third Edition, The by Anatole Olczak

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Appendix F. Pdksh

The Public Domain Korn Shell, or pdksh, is a free, public domain version of the Korn shell. It’s compatible with most any version of Unix such as SCO, BSD, Solaris, HP-UX, but is mostly used on Linux-based systems. It has most of the features of ksh88, as well as some ksh93 and additional features that are not in either. Here are a few of the features not in pdksh:

  • Exported aliases and functions

  • Set -t

  • Signals/traps not cleared during functions

  • Trap DEBUG, local ERR and EXIT traps in functions

  • ERRNO parameter

  • Float and structure datatypes

  • Compound and nameref variables

  • Associative arrays

  • Discipline functions

  • Search, replace, and substring operators

The source distribution contains more details on features not found in pdksh as well as current ...

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