[Gimp-user] batch changes

[Claudia]

I have folders containing varying numbers of photos or varying sizes.  
I need to make thumbnails of all photos: all to have a of height 150  
pixels, widths will vary, GIMP to scale width to the height. This is  
time consuming to do one at time. How can GIMP do this in batches?
Thank you for you time and assistance.
Claudia
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