#!/bin/sh# Wrong usage:printf'Hello %s.\n'printf'Hello %s, and goodbye %s.\n'# Correct usage:world="world"space="space"printf'Hello %s.\n'"${world}"printf'Hello %s, and goodbye %s.\n'"${space}""${world}"

Line 2:printf 'Hello %s.\n'       ^-- SC2183 (warning): This format string has 1 variable, but is passed 0 argument. Line 3:printf 'Hello %s, and goodbye %s.\n'       ^-- SC2183 (warning): This format string has 2 variables, but is passed 0 argument.