TAR Multiple Files into a GZIP FIle

If you want to tar your files together and gzip the resulting tar file.

 tar cfvz cvd.tar.gz cvd*.txt

To untar the gzip'd tar file you would do:

 tar xfvz cvd.tar.gz -C /path/to/parent/dir

This would extract your files under the /path/to/parent/dir directory