#!/bin/bash

function isOK1() {
    return 0
}

function isOK2() {
    return 100
}

if isOK1; then
  echo "isOK1 return true"
else
  echo "isOK1 return false"
fi

if isOK2; then
  echo "isOK2 return true"
else
  echo "isOK2 return false"
fi