You are welcome. Yes, the standard ksh is ksh88 and if you have dt installed there is a ksh93 version that is called /usr/dt/bin/dtksh. However, it is a version of ksh93 that is not recent enough for...
Take a deep look at your error report, note your "while" line!
The file c4_ai_account[0-9][0-9]_ does not exist.
Now look at you filenames...
c4_ai_account_01_20131129.dat
Let...