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NAME
sum - checksum and count the blocks in a file
SYNOPSIS
sum [-rs] [--sysv] [file...]
DESCRIPTION
This manual page documents the GNU version of sum. sum computes a 16-bit
checksum for each named file, or the standard input if none are given or
when a file named `-' is given. It prints the checksum for each file
along with the number of blocks in the file (rounded up), and the file
name unless no arguments were given. By default, the GNU sum computes
checksums using an algorithm that is compatible with the BSD sum and
prints file sizes in units of 1K blocks.
OPTIONS
-r Use the default (BSD compatible) algorithm. This option is included
for compatibility with the System V sum. Unless the -s option was
also given, it has no effect.
-s, --sysv
Compute checksums using an algorithm that is compatible with the one
the System V sum uses by default and print file sizes in units of
512-byte blocks instead of 1K.
The long-named options can be introduced with `+' as well as `--', for
compatibility with previous releases. Eventually support for `+' will be
removed, because it is incompatible with the POSIX.2 standard.