print to PDF?

[Jeffrey Ross <jeff bubble org>]

I have a handful of image scans that are saved as JPG files, I'd like to 
convert them to a single PDF file.

I know I can load the images one by one into one of the image 
manipulation programs and print them as individual pdf files but not a 
single file.

I'm sure there is a simple way from the command line to accomplish this.

Thanks, Jeff