By specification it should not print anything or fail in any way http://pubs.opengroup.org/onlinepubs/9699919799/utilities/true.html http://pubs.opengroup.org/o

By specification it should not print anything or fail in any way http://pubs.opengroup.org/onlinepubs/9699919799/utilities/true.html http://pubs.opengroup.org/onlinepubs/9699919799/utilities/tr... .