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-.TH LUHNCHECK 1 LUHNCHECK
-
-.SH NAME
-luhncheck \- Check number with Luhn's algorithm
-
-.SH SYNOPSIS
-.B luhncheck
-.IR number " ..."
-
-.SH DESCRIPTION
-The
-.B luhncheck
-utility checks that a number, containing a check digit,
-is valid according to Luhn's algorithm.
-
-.SH OPTIONS
-The
-.B luhncheck
-utility conforms to the Base Definitions volume of POSIX.1-2017,
-.IR "Section 12.2" ,
-.IR "Utility Syntax Guidelines" .
-.PP
-No options are supported.
-
-.SH OPERANDS
-The following operand is supported:
-.TP
-.I number
-Number to check.
-
-.SH STDIN
-Not used.
-
-.SH INPUT FILES
-None.
-
-.SH ENVIRONMENT VARIABLES
-No environment variables affect the execution of
-.BR luhncheck .
-
-.SH ASYNCHRONOUS EVENTS
-Default.
-
-.SH STDOUT
-The
-.B luhncheck
-utility will print one line per
-.IR number ,
-in the order they are provided in the command line,
-to the standard output.
-Each line will be use the format
-
-.RS
-.B \(dq%s is %s\en\(dq,
-.IB number ,
-.RI < \fB\(dqOK\(dq\fP\ if\ valid,\ \fB\(dqinvalid\(dq\fP\ otherwise >.
-.RE
-
-.SH STDERR
-The standard error is only used for diagnostic messages.
-
-.SH OUTPUT FILES
-None.
-
-.SH EXTENDED DESCRIPTION
-None.
-
-.SH EXIT STATUS
-The following exit values are returned:
-.TP
-0
-All
-.IR number s
-are valid.
-.TP
-1
-At least one
-.I number
-is invalid.
-.TP
-2
-An error occured.
-
-.SH SEE ALSO
-.BR gluhncheck (1)