sha1sum (1)

Quick Reference

Calculate SHA1 cryptographic checksums.

  • Calculate the SHA1 checksum for a file:

sha1sum {{filename1}}

  • Calculate SHA1 checksums for multiple files:

sha1sum {{filename1}} {{filename2}}

  • Read a file of SHA1 sums and verify all files have matching checksums:

sha1sum -c {{filename.sha1}}

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

SEE ALSO

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

Information

Source
Coreutils
OS/version
GNU coreutils 8.29.13-0a854
Source updated
December 2, 2018
Page created
February 9, 2018
Page generated
December 2, 2018