md5sum [OPTION]... [FILE]...
Print or check MD5 (128-bit) checksums.
With no FILE, or when FILE is -, read standard input.
read in binary mode
read MD5 sums from the FILEs and check them
--tag create a BSD-style checksum
read in text mode (default)
The following five options are useful only when verifying checksums:
don't fail or report status for missing files
don't print OK for each successfully verified file
don't output anything, status code shows success
exit non-zero for improperly formatted checksum lines
warn about improperly formatted checksum lines
--help display this help and exit
output version information and exit
The sums are computed as described in RFC 1321. When checking, the
input should be a former output of this program. The default mode is
to print a line with checksum, a space, a character indicating input
mode ('*' for binary, ' ' for text or where binary is insignificant),
and name for each FILE.
The MD5 algorithm should not be used any more for security related pur-
poses. Instead, better use an SHA-2 algorithm, implemented in the pro-
grams sha224sum(1), sha256sum(1), sha384sum(1), sha512sum(1)
Written by Ulrich Drepper, Scott Miller, and David Madore.
GNU coreutils 8.25 February 2017 MD5SUM(1)
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