What is md5sum?
5 md5sum examples
Syntax and Options
Related Commands
What is md5sum?
md5sum is a 128 bit checksum which will be unique for the same data provided. Use md5sum command to calculate and cross check the md5sum.
Two non identical files will never have the same md5sum. Typically, md5sum is used to cross verify the integrity of a file after downloading it from a website.
5 md5sum Examples
Calculate / Compute md5sum
Calculate or compute md5sum for the input file.
$ md5sum samplefile.txt 3b85ec9ab2984b91070128be6aae25eb samplefile.txt
Calculate or compute md5sum for the input given through STDIN.
$ md5sum - test d8e8fca2dc0f896fd7cb4cb0031ba249 -
Compute and Verify checksum of files
Compute and store the md5sum of files in a file, and then cross check it with -c option.
$ md5sum *.vim bbd166fee3f3f624286c4d85dc1994f8 NERD_tree.vim 50dcf8c353827eef464cb79f55018d6c SearchComplete.vim 5d2a1217ddecff630528c64a04ee7f9e utl.vim $ md5sum *.vim > t.md5 $ md5sum -c t.md5 NERD_tree.vim: OK SearchComplete.vim: OK utl.vim: OK
When there is a change in any of the file, you will get the “computed checksums did NOT match” warning message.
$ md5sum -c t.md5 NERD_tree.vim: OK SearchComplete.vim: OK utl.vim: FAILED md5sum: WARNING: 1 of 3 computed checksums did NOT match
Syntax and Options
md5sum [OPTION]… [FILE]…
| Short Option | Long Option | Option Description |
|---|---|---|
| -b | –binary | read in binary mode |
| -c | –check | read MD5 sums from the FILEs and check them |
| -t | –text | read in text mode (default) |
| –quiet | don’t print OK for each successfully verified file | |
| –status | don’t output anything, status code shows success | |
| -w | –warn | warn about improperly formatted checksum lines |
Related Commands
cksum