grc (generic colouriser) grc provides two programs: grc and grcat. The main is grcat, which acts as a filter, i.e. taking standard input, colourising it and writing to standard output. grcat takes as a parameter the name of configuration file. To use, add following lines into your ~/.bashrc, ~/.zshrc or in ~/.config/fish/config.fish: [[ -s "/etc/profile.d/grc.bashrc" ]] && source /etc/profile.d/grc.bashrc [[ -s "/etc/profile.d/grc.zsh" ]] && source /etc/profile.d/grc.zsh [[ -s "/etc/profile.d/grc.fish" ]] && source /etc/profile.d/grc.fish