To resize image for thumbnail in linux

Need the thumbnail, Here is the utility I used..

First install the imagemagic
sudo apt-get intsall imagemagic

Use convert command to make your thumbnail.

Here 200 is the 200px width
convert -thumbnail 200 DSC01536.JPG DSC01536_thumb.JPG

Here x200 is the 200px height
convert -thumbnail x200 DSC01536.JPG DSC01536_thumb.JPG