If a @var{file} is specified as @samp{-} or if no files are given
@command{md5sum} computes the checksum for the standard input.
@command{md5sum} can also determine whether a file and checksum are
-consistent. Synopses:
+consistent. Synopsis:
@example
md5sum [@var{option}]@dots{} [@var{file}]@dots{}
-md5sum [@var{option}]@dots{} --check [@var{file}]
@end example
For each @var{file}, @samp{md5sum} outputs the MD5 checksum, a flag
@item -c
@itemx --check
-Read file names and checksum information from the single @var{file}
-(or from stdin if no @var{file} was specified) and report whether
-each named file and the corresponding checksum data are consistent.
+Read file names and checksum information (not data) from each
+@var{file} (or from stdin if no @var{file} was specified) and report
+whether the checksums match the contents of the named files.
The input to this mode of @command{md5sum} is usually the output of
a prior, checksum-generating run of @samp{md5sum}.
Each valid line of input consists of an MD5 checksum, a binary/text