Batch extract contents of folder in .tgz files

I'd like to extract lots of .tgz files, well a particular folder inside the tgz into folder (overwriting files if the source is newer than target). Is there a command I can use, or a program that will do this efficiently?

thanks

Use a for loop
Say something like
for %i in ( *.tgz ) do echo %i

If you know what command (in this example echo) you want to apply to one file, then this will efficiently apply the same thing to all tgz files.

Do you mean I should write a program to do this? I'm not sure how to look inside a tgz file to extract the folder and to set it to only overwrite if newer