compute and check MD5 message digest


Calculate the MD5 checksum for one or more files

$ md5sum [path/to/file1 path/to/file2 ...]

Calculate and save the list of MD5 checksums to a file
$ md5sum [path/to/file1 path/to/file2 ...] > [path/to/file.md5]

Calculate an MD5 checksum from stdin
$ [command] | md5sum

Read a file of MD5 sums and filenames and verify all files have matching checksums
$ md5sum --check [path/to/file.md5]

Only show a message for missing files or when verification fails
$ md5sum --check --quiet [path/to/file.md5]

Only show a message when verification fails, ignoring missing files
$ md5sum --ignore-missing --check --quiet [path/to/file.md5]


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 checksums 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't fail or report status for missing files


don't print OK for each successfully verified file


don'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 ('*' for binary, ' ' for text or where binary is insignificant), and name for each FILE.

Note: There is no difference between binary mode and text mode on GNU systems.


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)


GNU coreutils online help: <>
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Copyright © 2023 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.


cksum(1) Full documentation <> or available locally via: info '(coreutils) md5sum invocation'


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

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