compute and check MD5 message digest
Calculate the MD5 checksum for a file
Calculate MD5 checksums for multiple files
Calculate a MD5 checksum from the standard input
Read a file of MD5SUMs and verify all files have matching checksums
Only show a message for missing files or when verification fails
Only show a message for files for which verification fails, ignoring missing files
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)
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Copyright © 2022 Free Software Foundation, Inc. License GPLv3+: GNU
GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
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 <https://www.gnu.org/software/coreutils/md5sum> or available locally via: info '(coreutils) md5sum invocation'
Written by Ulrich Drepper, Scott Miller, and David Madore.