A missing letter, nothing more
@ -133,7 +133,7 @@ class ExitCode
self::NOINPUT => 'Input file not found or unreadable',
self::NOUSER => 'User not found',
self::NOHOST => 'Host not found',
self::UNAVAILABLE => 'A requied service is unavailable',
self::UNAVAILABLE => 'A required service is unavailable',
self::SOFTWARE => 'Internal error',
self::OSERR => 'Error making system call or using OS service',
self::OSFILE => 'Error accessing system file',