How may I copy multiple files in multiple folders into one folder and change their names according to what directory they are copied from?
Initial directory hierarchy:
folder1/
file1.gz
filexyz.gz
folder2/
file1.gz
filexyz.gz
folder3/
file1.gz
filexyz.gz
Result:
folder1_file1.gz
folder2_file1.gz
folder3_file1.gz
folder1_filexyz.gz
folder2_filexyz.gz
folder3_filexyz.gz