@wjalford ,
Try this ?
dt = Open( "$SAMPLE_DATA/Big Class.jmp" );
CurrentCols = dt << Get Column Names("String");
Show(CurrentCols);
for(i = 1, i <= N Items(CurrentCols) , i++,
Column(dt,i) << Set Name(Uppercase(CurrentCols[i]));
);
NewCols = dt << Get Column Names("String");
Show(NewCols);
You are going on the right track, the thing that you needed to add was the ability to set the column names in the table back to your new column names.
Best
Uday