pamfile
Describe Netpbm (PAM or PNM) files.
TLDR
Describe the specified Netpbm files
$ pamfile [path/to/file1 path/to/file2 ...]
Describe every image in each input file (as opposed to only the first image in each file) in a machine-readable format
$ pamfile -allimages -machine [path/to/file]
Display a count on how many images the input files contain
$ pamfile -count [path/to/file]