pcxtoppm
converts PCX bitmap images to PPM format
TLDR
Convert PCX to PPM
$ pcxtoppm [input.pcx] > [output.ppm]
SYNOPSIS
pcxtoppm [file]
DESCRIPTION
pcxtoppm converts PCX bitmap images to PPM format. Handles 256-color and 24-bit PCX files. 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