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
-t, --text read in text mode (default)

The following three options are useful only when verifying checksums:

--quiet 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
--help 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 type (‘*’ for binary, ‘ ’ for text), and name for each FILE.


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


Report sha1sum bugs to GNU coreutils home page: <> General help using GNU software: <>


Copyright © 2009 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.


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.

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