pbmtoascii
Convert a PBM image to ASCII graphics.
TLDR
Read a PBM file as input and produce an ASCII output
$ pbmtoascii [path/to/input_file.pbm]
Read a PBM file as input and save an ASCII output into a file
$ pbmtoascii [path/to/input_file.pbm] > [path/to/output_file]
Read a PBM file as input while setting the pixel mapping (defaults to 1x2)
$ pbmtoascii -[1x2|2x4] [path/to/input_file.pbm]
Display version
$ pbmtoascii -version