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NAME
luhncheck - Check number with Luhn's algorithm
SYNOPSIS
luhncheck number ...
DESCRIPTION
The luhncheck utility checks that a number, containing a
check digit, is valid according to Luhn's algorithm.
OPTIONS
The luhncheck utility conforms to the Base Definitions volume
of POSIX.1-2017, Section 12.2, Utility Syntax Guidelines.
No options are supported.
OPERANDS
The following operand is supported:
number
Number to check.
STDOUT
The luhncheck utility will print one line per number, in the
order they are provided in the command line, to the standard
output. Each line will be use the format
"%s is %s\n", number, <"OK" if valid, "invalid" otherwise>.
EXIT STATUS
The following exit values are returned:
0 All numbers are valid.
1 At least one number is invalid.
2 An error occured.
SEE ALSO
gluhncheck(1)
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