BISMG:SarahS/handy stuff

Create a tar (.tgz)

 * find all files with size > 100k. Write to a list


 * find ./tests/*/*/*.nc -size +100 -print > test_filenames


 * Compress all files in the list
 * tar -cvzf mytarfile.tgz -T test_filenames


 * Uncompress
 * tar xvzf mytarfile.tgz