undo a gzip recursively

Question

OK, so I did a stupid, and forgot to specify a filename in the process of doing a website backup.

Now, all my files say file_name.extn.gz

How do I get all those mistakenly gzipped files back to normal?

I've tried tar, unzip, etc but not successful. The directories are not .gz, only each file inside.

System is 14.04.4 LTS

Answer 1

What gzip -r does, gunzip -r undoes:

$ gzip foo -r
$ find foo 
foo
foo/d
foo/d/1.gz
foo/a
foo/a/3.gz
$ gunzip -r foo
$ find foo     
foo
foo/d
foo/d/1
foo/a
foo/a/3