Section (1) md5sum

Linux manual pages Section 1  


md5sum — compute and check MD5 message digest


md5sum [OPTION...] [FILE...]


Print or check MD5 (128−bit) checksums.

With no FILE, or when FILE is −, read standard input.

−b, −−binary

read in binary mode

−c, −−check

read MD5 sums from the FILEs and check them


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:


don_zsingle_quotesz_t fail or report status for missing files


don_zsingle_quotesz_t print OK for each successfully verified file


don_zsingle_quotesz_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 RFC 1321. 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.


Do not use the MD5 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 any translation bugs to <>


Full documentation <>

or available locally via: info _zsingle_quotesz_(coreutils) md5sum invocation_zsingle_quotesz_


Copyright © 2019 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.