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SHA1SUM

Section: User Commands (1)
Updated: September 2017
Index Return to Main Contents
 

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 aq(coreutils) sha1sum invocationaq


 

Index

NAME
SYNOPSIS
DESCRIPTION
The following five options are useful only when verifying checksums:
BUGS
AUTHOR
REPORTING BUGS
COPYRIGHT
SEE ALSO


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