Thunar
Useful User Actions:
Resizing images also see ImageMagick
echo %F | awk 'BEGIN { RS = " " }; {print $0}' | xargs -L1 mogrify -resize 50%
echo %F | awk 'BEGIN { RS = " " }; {print $0}' | xargs -L1 mogrify -resize 1000x1000\>
(on Image files, pattern *)
Merge pdfs (pdftk package needed)
pdftk %F cat output merge.pdf
(on filetype pdf)