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}}


sha1sum - compute and check SHA1 message digest


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


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
create a BSD-style checksum
-t, --text
read in text mode (default)

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
-w, --warn
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.


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)


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


GNU coreutils online help: <>
Report sha1sum translation bugs to <>


Full documentation at: <>
or available locally via: info '(coreutils) sha1sum invocation'


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