Linux man pages

Section (1) sha1sum

Linux manual pages	Section 1

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)
−z, −−zero: end each output line with NUL, not newline, and disable file name escaping

The following five options are useful only when verifying checksums:

−−ignore−missing: don_zsingle_quotesz_t fail or report status for missing files
−−quiet: don_zsingle_quotesz_t print OK for each successfully verified file
−−status: don_zsingle_quotesz_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 (_zsingle_quotesz_*_zsingle_quotesz_ for binary, _zsingle_quotesz_ _zsingle_quotesz_ 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/>

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