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 bugs/anomolies.