How to rename multiple files at once? I want to rename multiple files at once. For example: 

Picture1.jpg
Picture2.jpg
Picture3.jpg
Picture4.jpg


into

Vacation-Picture1.jpg
Vacation-Picture2.jpg
Vacation-Picture3.jpg
Vacation-Picture4.jpg


I am quite familiar with the terminal, if there is no app which is quite good in renaming files.
No need for command line...


Add all the images to be renamed into a folder.
Select all files, right click mouse and select "Rename x items"
Select "Add text" from first drop down menu
Select "Before name" from the second drop down menu
Enter "Vacation_" into the text box (without the quotation marks)
Press Enter.