sha1sum(1) -- Linux man page

 

NAME

shasum - compute and check SHA1 message digest  

SYNOPSIS

sha1sum [OPTION] [FILE]...
sha1sum [OPTION] --check [FILE]  

DESCRIPTION

Print or check SHA1 (160-bit) checksums. With no FILE, or when FILE is -, read standard input.

-b, --binary
read files in binary mode (default on DOS/Windows)
-c, --check
check SHA1 sums against given list
-t, --text
read files in text mode (default)
 

The following two options are useful only when verifying checksums:

--status
don't output anything, status code shows success
-w, --warn
warn about improperly formated 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 character indicating type (`*' for binary, ` ' for text), and name for each FILE.  

AUTHOR

Written by Ulrich Drepper and Scott Miller.  

REPORTING BUGS

Report bugs to <bug-coreutils@gnu.org>.  

COPYRIGHT

Copyright © 2004 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  

SEE ALSO

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

should give you access to the complete manual.