pgmtopgm
copies PGM images, normalizing format
TLDR
Copy PGM image
$ pgmtopgm [input.pgm] > [output.pgm]
SYNOPSIS
pgmtopgm [file]
DESCRIPTION
pgmtopgm copies PGM images, normalizing format. Functions as a no-op filter in pipelines. Part of Netpbm toolkit.
INSTALL
sudo apt install netpbm
sudo dnf install netpbm
sudo pacman -S netpbm
sudo apk add netpbm
sudo zypper install netpbm
brew install netpbm
nix profile install nixpkgs#netpbm