Commands using md5sum

Replace "user/sbin/sshd" with the file you would like to check. If you are doing this due to intrusion, you obviously would want to check size, last modification date and md5 of the md5sum application itself. Also, note that "/var/lib/dpkg/info/*.md5sums" files might have been tampered with themselves. Neither to say, this is a useful command.

This functionality seems to be missing from commands like dpkg. Ideally, I want to duplicate the behavior of rpm --verify, but it seems difficult to do this in one relatively short command pipeline.

This is a modified version of the OP, wrapped into a bash function.

This version handles newlines and other whitespace correctly, the original has problems with the thankfully rare case of newlines in the file names.

It also allows checking an arbitrary number of directories against each other, which is nice when the directories that you think might have duplicates don't have a convenient common ancestor directory.

Create a bash function for easy reference

webPassword()

{

echo $1 $2 | md5sum | awk '{print substr($0,0,10)}'

}

alias webpwd=webPassword

Use like this.

webpwd www.commandlinefu.com MyPetNameHere

Here Strings / A variant of here documents, the format is:

(from bash manpage)

Why remember? Generate!

Up to 48 chars, works on any unix-like system (NB: BSD use md5 instead of md5sum)

Command makes use of the Malware Hash Registry (http://www.team-cymru.org/Services/MHR/).

It parses the current directory and subdirectories and calculates the md5 hash of the files, then prints the name and sends the hash to the MHR for a lookup in their database.

The 3rd value in the result is the detection percentage across a mix of AV packages.

I liked vaporub's suggestion, here a little simplification of the sed command.

extracts path to each md5 checksum file, then, for each path, cd to it, check the md5sum, then cd - to toggle back to the starting directory. greps at the end to remove cd chattering on about the current directory.

Same result with simpler regular expression..

Generates the md5 hash, without the trailing " -" and with the output "broken" into pairs of hexs.

Nothing special about hashing here, only the use of cut, I think, could result at fewer keystrokes.

Backups $DIR_TO_BACKUP into tape, creating on the fly a MD5SUM file of the backup.

Then rewinds one record on tape and checks if it's well written.

I had the problem that the Md5 Sum of a file changed after copying it to my external disk.

This unhandy command helped me to fix the problem.

Use zsh process substitution syntax.