xxxxxxxxxx
## if in directory
mv currentName.txt newName.txt
## if not in directorty
mv DIR/currentName.txt DIR/newName.txt
xxxxxxxxxx
sudo apt install -y mmv
mmv original_name\* new_name\#1
## OLD NAMES: original_name1 original_name2 original_name3
## NEW NAMES: new_name1 new_name2 new_name3