.TH GLUHNCHECK 1 GLUHNCHECK .SH NAME gluhncheck \- Check number with Luhn's algorithm .SH SYNOPSIS .B gluhncheck .SH DESCRIPTION .B gluhncheck is a graphical utility that checks that a number, containing a check digit, is valid according to Luhn's algorithm. .SH OPTIONS The .B gluhncheck 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 No operands are supported. .SH ENVIRONMENT VARIABLES The execution of .B gluhncheck is affected by environment variables that affects its tooltik. .SH SEE ALSO .BR luhncheck (1)