Force New Thumbnail for PCmanFM

#if you have thumbnails setup for your file manager (example: pcmanfm)
#but thumbnails are not showing up after editing the photo
#this will create and embed a new thumbnail

#install exiftran (exif - Exchangeable Image File)
sudo aptitude install exiftran

#create thumbnail for file
exiftran -i -g file.jpg

#all files
exiftran -i -g *