1SHA1SUM(1)                       User Commands                      SHA1SUM(1)
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NAME

6       sha1sum - compute and check SHA1 message digest
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SYNOPSIS

9       sha1sum [OPTION]... [FILE]...
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DESCRIPTION

12       Print or check SHA1 (160-bit) checksums.
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14       With no FILE, or when FILE is -, read standard input.
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16       -b, --binary
17              read in binary mode
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19       -c, --check
20              read SHA1 sums from the FILEs and check them
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22       --tag  create a BSD-style checksum
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24       -t, --text
25              read in text mode (default)
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27       -z, --zero
28              end  each  output  line  with NUL, not newline, and disable file
29              name escaping
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31   The following five options are useful only when verifying checksums:
32       --ignore-missing
33              don't fail or report status for missing files
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35       --quiet
36              don't print OK for each successfully verified file
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38       --status
39              don't output anything, status code shows success
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41       --strict
42              exit non-zero for improperly formatted checksum lines
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44       -w, --warn
45              warn about improperly formatted checksum lines
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47       --help display this help and exit
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49       --version
50              output version information and exit
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52       The sums are computed as described in FIPS-180-1.  When  checking,  the
53       input  should  be a former output of this program.  The default mode is
54       to print a line with checksum, a space, a  character  indicating  input
55       mode  ('*'  for binary, ' ' for text or where binary is insignificant),
56       and name for each FILE.
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58       Note: There is no difference between binary mode and text mode  on  GNU
59       systems.
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BUGS

62       Do not use the SHA-1 algorithm for security related purposes.  Instead,
63       use an SHA-2  algorithm,  implemented  in  the  programs  sha224sum(1),
64       sha256sum(1),  sha384sum(1),  sha512sum(1),  or  the  BLAKE2 algorithm,
65       implemented in b2sum(1)
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AUTHOR

68       Written by Ulrich Drepper, Scott Miller, and David Madore.
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REPORTING BUGS

71       GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
72       Report   sha1sum   translation   bugs    to    <https://translationpro‐
73       ject.org/team/>
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76       Copyright  ©  2018  Free Software Foundation, Inc.  License GPLv3+: GNU
77       GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
78       This is free software: you are free  to  change  and  redistribute  it.
79       There is NO WARRANTY, to the extent permitted by law.
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SEE ALSO

82       Full documentation at: <https://www.gnu.org/software/coreutils/sha1sum>
83       or available locally via: info '(coreutils) sha1sum invocation'
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87GNU coreutils 8.30                 July 2018                        SHA1SUM(1)
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