You can suppress output in
Mathematica by placing a semicolon (;) at the end of the line:
This creates a small table of values and exports it to a text file. There is no point in seeing the numbers, so the result is suppressed:
You can also use ; to condense multiple lines into a single line. The output here is 2 since only the output of the last statement,

, is displayed:
Use ; at the end to stop any output:
Using ; to chain commands extends to any number: