After installing zshell and applying the zshrc from grml system-wide, my man page doesn’t want to be colourful. The configuration is caused by a environmental variable GROFF_NO_SGR, when it’s set to 1, man page will be able to paint with colour.
Here is my personal .zshrc:
# Vim key binding bindkey -v # The important part. export GROFF_NO_SGR=1 # PATH to current directory export PATH=$PATH:.