$ test EXPRESSION

To test a value 

$ test 10 -gt 9 && echo "Yes, that's true." || echo "No, that's false."

$ test 9 -gt 10 && echo "Yes, that's true." || echo "No, that's false."

$ test 1000 -lt 999 && echo "Yes." || echo "No."

$ test 999 -lt 1000 && echo "Yes." || echo "No."