pdksh  5.2.14
About: a mostly complete AT&T ksh look-alike PD-ksh is a mostly complete AT&T ksh look-alike. Work is currently underway to make it fully compatible with both POSIX and AT&T ksh (when the two don't conflict).
  Fossies Dox: pdksh-5.2.14.tar.gz  ("inofficial" and yet experimental doxygen-generated source code documentation)  

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pdksh Documentation