[ Git 常見問題 ] Git - list all authors of a folder of files?

Source From Here 
Question 
How can I list the author names of a particular folder that's versioned by git? 

I see that I can git blame a file and list the author of each line, but I can't do that for a folder, and I would also like only a unique list (each author listed only once) 

How-To 
Based on The shortest possible output from git log containing author and date, you can use command git log: 

// '%an': author name
// '%x00': print a byte from a hex code
# git log --pretty=format:"%an%x09" myfolder | sort | uniq

Supplement 
* Git log pretty-formats