2. EL 8
  3. coreutils-common
  4. sha1sum(1)

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SHA1SUM(1) User Commands SHA1SUM(1)

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.

read in binary mode
read SHA1 sums from the FILEs and check them
create a BSD-style checksum
read in text mode (default)
end each output line with NUL, not newline, and disable file name escaping

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
display this help and exit
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.

Note: There is no difference between binary mode and text mode on GNU systems.

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: <https://www.gnu.org/software/coreutils/>
Report sha1sum translation bugs to <https://translationproject.org/team/>

COPYRIGHT

Copyright © 2018 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <https://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: <https://www.gnu.org/software/coreutils/sha1sum>
or available locally via: info '(coreutils) sha1sum invocation'

July 2018 GNU coreutils 8.30