Korn Shell: Unix and Linux Programming Manual, Third Edition, The By Anatole Olczak
Table of Contents
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.
