Solaris

I have the following code that works perfectly in Cygwin

Code:

$ awk -F, '
 BEGIN   {months ["JAN"]="AP01"; months ["FEB"]="AP02"; months ["MAR"]="AP03";
          months ["APR"]="AP04"; months ["MAY"]="AP05"; months ["JUN"]="AP06";
          months ["JUL"]="AP07"; months ["AUG"]="AP08"; months ["SEP"]="AP09";
          months ["OCT"]="AP10"; months ["NOV"]="AP11"; months ["DEC"]="AP12";
         }
         {TMP = FILENAME
          sub (/\..*$/, "", TMP)
          print> "a_" TMP "_ACTUAL_"months[substr($3,0,3)]"-20" substr($3,5,2)"_RR.txt"
         }
 ' *.txt

This codes splits any txt file into multiple txt files based on field number three. The new files are named using a portion of the original file and the Accounting Periods (AP) listed at the beginning of the script.
As I move the script to the server (Solaris) it generates a syntax error during execution. The error reads: Syntax error near line 7. Line 7 is the assignment of the current filename to the TMP variable.

As I mentioned this is not an issue in Cygwin. The script runs as expected but not so in Solaris. Any help will be greatly appreciated

Where is the END rule?
Or is this just part of the code?

? The END section is optional.
Put the computed target for print in brackets

Code:

print> ("a_" TMP "_ACTUAL_"months[substr($3,0,3)]"-20" substr($3,5,2)"_RR.txt")

And use nawk or /usr/xpg4/bin/awk

Thanks you guys the answer was as simple as changing the awk to gawk.

Problem solved.