Provided by: coreutils_8.28-1ubuntu2_amd64 bug

NAME

       sha1sum - compute and check SHA1 message digest

SYNOPSIS

       sha1sum [OPTION]... [FILE]...

DESCRIPTION

       Print or check SHA1 (160-bit) checksums.

       With no FILE, or when FILE is -, read standard input.

       -b, --binary
              read in binary mode

       -c, --check
              read SHA1 sums from the FILEs and check them

       --tag  create a BSD-style checksum

       -t, --text
              read in text mode (default)

   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 FIPS-180-1.  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.

BUGS

       Do not use the SHA-1 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)

AUTHOR

       Written by Ulrich Drepper, Scott Miller, and David Madore.

REPORTING BUGS

       GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
       Report sha1sum translation bugs to <http://translationproject.org/team/>

COPYRIGHT

       Copyright © 2017 Free Software Foundation, Inc.  License GPLv3+:  GNU  GPL  version  3  or
       later <http://gnu.org/licenses/gpl.html>.
       This  is free software: you are free to change and redistribute it.  There is NO WARRANTY,
       to the extent permitted by law.

SEE ALSO

       Full documentation at: <http://www.gnu.org/software/coreutils/sha1sum>
       or available locally via: info '(coreutils) sha1sum invocation'