creating several image thumbnails from shell prompt

First, install ImageMagick.

# apt-get install imagemagick

You need to pass -thumbnail argument to convert command:
convert thumbnail <width>x<height> image.png thumbnail.png

So to create a thumbnail of the abc.png image with 200px width, you need to type:

$ convert -thumbnail 200 abc.png thumb.abc.png

To create a thumbnail of the abc.png image with 200px height, you need to type:

$ convert -thumbnail x200 abc.png thumb.abc.png

To create a thumbnails from several images in a folder.

ls *.png | xargs -I {} convert -thumbnail 200 {} thumb.{}

You can replace the image file extension with the one you need.

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