Sometimes Nautilus' icon thumbnails and/or metadata for a file, photo, or folder just aren't good enough to make sure it's the desired file.
Is there an app for Ubuntu similar to Mac OSX's "Quick Look" feature in order to get a closer look without opening the file?
GNOME Sushi can add a Mac OSX style "Quick Look" feature to the Nautilus file manager. It is not installed by default, but you can install it. Open a terminal (CTRL+ALT+T) and execute the following commands:
How to use: Just select a file and tap the Space bar to see a larger (and sometimes interactive) preview.
Features:
It can provide an instant preview of a folder, image, music or a video file using the
GStreamer
framework.Sushi also supports previewing most plain text documents, including scripts with syntax highlighting, PDFs, and HTML files.
It's a quick and effective way to take a quick peek at PDFs, photos, MP3s, videos, and other documents without having to fully open them.
Note: Unfortunately, unlike OSX, Sushi doesn't update the preview window if you move off of it and select other files. Source