From 77cfffee6177fb0421fa0fce15d6a1875bde4816 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?David=20W=C3=BChrer?= <def@gmx.at>
Date: Sat, 18 May 2024 21:04:34 +0200
Subject: manuals, sum-down, radix

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 man/man1/ean13.1 | 35 +++++++++++++++++++++++++++++++++++
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 create mode 100644 man/man1/ean13.1

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+.TH ean13 1 2024-03-15 utils
+
+.SH NAME
+ean13 \- check or compute european article numbers
+
+.SH SYNOPSIS
+.B ean13
+.RI [ arg\ ... ]
+
+.SH DESCRIPTION
+.B ean13
+checks for each argument if it is a valid EAN13 number,
+that is a European Article Number that has 13 digits;
+or computes the checksum digit if the argument has only 12 digits. 
+
+.SH EXIT STATUS
+.TP
+.B 0
+If the number is valid or the checksum is computed.
+
+.TP
+.B 1
+If the number is not valid.
+
+.SH EXAMPLES
+.HP
+Compute the checksum number:
+
+.BR ean13 \ 012345678901
+
+.HP
+Check if the number is a valid EAN13:
+
+.BR ean13 \ 0123456789012
+
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