How to set the number of lines between isql's column headers

Abstract: How to set the number of lines between isql's column headers

Problem: when executing a query with isql it will print the column headers every 20 lines. How can this be changed? Solution: isql has a startup parameter to set the number of lines between column headers being printed. The switch is -pagelength and is documented in the v5 operations guide p195. This switch works on both version 4.0 and version 5.0.