Show n number of logs for x user in colour by adding this little snippet in your .bashrc file or you can keep it in a .sh file.

gitlog() {
    if [ "$1" ] && [ "$2" ]; then
       git log --pretty=format:"%h%x09 %C(cyan)%an%x09 %Creset%ad%x09 %Cgreen%s" --date-order -n "$1" --author="$2"
    elif [ "$1" ]; then
       git log --pretty=format:"%h%x09 %C(cyan)%an%x09 %Creset%ad%x09 %Cgreen%s" --date-order -n "$1"
    else
        git log --pretty=format:"%h%x09 %C(cyan)%an%x09 %Creset%ad%x09 %Cgreen%s" --date-order
    fi
}

alias l=gitlog


To show the last 10 commits by Frank:

l 10 frank

To show the last 20 commits by anyone:

l 20