вычислить и проверить дайджест сообщения MD5  (compute and check MD5 message digest)
  
Имя (Name)
md5sum - compute and check MD5 message digest
Синопсис (Synopsis)
md5sum [OPTION]... [FILE]...
Описание (Description)
Print or check MD5 (128-bit) checksums.
       With no FILE, or when FILE is -, read standard input.
       -b, --binary
              read in binary mode
       -c, --check
              read MD5 sums from the FILEs and check them
       --tag  create a BSD-style checksum
       -t, --text
              read in text mode (default)
       -z, --zero
              end each output line with NUL, not newline, and disable
              file name escaping
   The following five options are useful only when verifying checksums:
       --ignore-missing
              don't fail or report status for missing files
       --quiet
              don't print OK for each successfully verified file
       --status
              don't output anything, status code shows success
       --strict
              exit non-zero for improperly formatted checksum lines
       -w, --warn
              warn about improperly formatted checksum lines
       --help display this help and exit
       --version
              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.
       Note: There is no difference between binary mode and text mode on
       GNU systems.
Ошибки (баги) (Bugs)
Do not use the MD5 algorithm for security related purposes.
       Instead, use an SHA-2 algorithm, implemented in the programs
       sha224sum(1), sha256sum(1), sha384sum(1), sha512sum(1), or the
       BLAKE2 algorithm, implemented in b2sum(1)