errno − search POSIX error codes by error number, error name, or error description
errno is a simple script that interprets a POSIX error code, or finds error codes related to a search string.
$ errno 36
ENAMETOOLONG 36 /* File name too long */
$ errno perm
EPERM 1 /* Operation not permitted */
EACCES 13 /* Permission denied */
This manpage and the utility was written by Dustin Kirkland <kirkland [AT] ubuntu.com> for Ubuntu systems (but may be used by others). Permission is granted to copy, distribute and/or modify this document under the terms of the GNU General Public License, Version 2 published by the Free Software Foundation.
On Debian systems, the complete text of the GNU General Public License can be found in /usr/share/common-licenses/GPL.