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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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