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 three options are useful only when verifying checksums:


don't print OK for each successfully verified file


don't output anything, status code shows success

−w, −−warn

warn about improperly formatted checksum lines


with −−check, exit non−zero for any invalid input


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 character indicating input mode ('*' for binary, space for text), and name for each FILE.


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


Report sha1sum bugs to bug−

GNU coreutils home page: <>

General help using GNU software: <>

Report sha1sum translation bugs to <>


The full documentation for sha1sum is maintained as a Texinfo manual. If the info and sha1sum programs are properly installed at your site, the command

  • info coreutils 'sha1sum invocation'

should give you access to the complete manual.


Copyright © 2013 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <>.

This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.