.Dd October 8, 2015
.Dt CKSUM 1
.Os sbase
.Sh NAME
.Nm cksum
.Nd compute file checksum
.Sh SYNOPSIS
.Nm
.Op Ar file ...
.Sh DESCRIPTION
.Nm
calculates a cyclic redundancy check (CRC) of
.Ar file
according to
.St -iso8802-3
and writes it, the file size in bytes and path to stdout.
.Pp
If no
.Ar file
is given,
.Nm
reads from stdin.
.Sh STANDARDS
POSIX.1-2013.