sed -i „s/mnt\/sda/home\/x/g“ file
This replaces path /mnt/sda with /home/x
sed -i „s/mnt.*/home\/x/g“ file
This replaces all passges start with /mnt and any chars after it with /home/x
sed -i „s/rotate.*/rotate = flip/g“ *
Replaces in all files in folder the passage rotate with any chard until end of line with rotate=flip