mjhjmtu

I have a directory full of files. Each file will be copied to a specific type of destination host.

I want to calculate an MD5 sum for each file in the directory, and store that md5 sum in a file that matches the name of the file that generated the sum, but with .md5 appended.

So, for instance, if I have a directory with:

a.bin
b.bin
c.bin

The final result should be:

a.bin
a.bin.md5 # a.bin's calculated checksum
b.bin
b.bin.md5 # b.bin's calculated checksum
c.bin
c.bin.md5 # c.bin's calculated checksum

I have attempted this with find exec, and with xargs.

With find, I tried this command:

find . -type f -exec md5sum + > .md5

Using xargs, I tried this command:

find . -type f | xargs -I md5sum > .md5

In either case, I end up with a file called .txt, which isn't really what I am looking for.

Could anyone point out how to tweak these to generate the md5 files I am looking to generate?

cd /path/to/files &&
for file in *; do
 if [[ -f "$file" ]]; then
 md5sum -- "$file" > "$file.md5"
 fi
done

Redirection is an operator of the shell.

In:

find some args > .md5

find is run with some args and its stdout redirected to .md5.

Here, you'd need find to start a shell to perform one redirection for each file:

find . -type f -exec sh -c '
 for file do
 md5sum "$file" > "$file.md5"
 done' sh +

If you want to avoid the directory component in the .md5 part, you can either use the -execdir alternatives supported by many find implementations (though with some you'll still get a ./ directory component, and with some, that will still run one shell per file even with +:

find . -type f -execdir sh -c '
 for file do
 md5sum "$file" > "$file.md5"
 done' sh +

Or you can do it as:

find . -type f -exec sh -c '
 for file do
 (cd "${file%/*" && exec md5sum -- "$file##*/") > "$file.md5"
 done' sh +

I know there are side effects to piping into a while loop, but I like the simplicilty, readability and extensibilty of this solution

find . -type f ! -name *.md5 |
 while read a; do md5sum $a > $a.md5; done

To use this scipplet to check sums simply:

find . -type f ! -name *.md5 |
 while read a; do echo $a; md5sum -c $a.md5; done

find . -name '*.iso' -type f -exec sh -c "ls -lh ; pv | md5sum > .md5" ;

optional

ls -lh ;

to show processing file, and

pv 

to show progressbar on big (slow) iso file in my case

cd /path/to/files && ls -1| xargs md5sum | xargs -l bash -c 'echo $0" "$1 > $1.md5'

first xargs generate , second xargs picks up and save to .md5

If you need filter file patter, you can replace ls with find or add grep afterwards.