One line GIT command to emulate a "gitk like" log:
git log --graph --full-history --all --color \
--pretty=format:'%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr) %C(bold blue)%cN <%cE>%Creset'
The same without full history:
git log --graph --all --color \