my OS is ubuntu and I got the same error even after performing the git config commands. What I noticed was that the error was telling me to input "global" git config. So I used the following and it worked.

root@lcfs-vm:/git-test# git config --global user.name "Genius"

root@lcfs-vm:/git-test# git config --global user.email "genius@genius.com"

root@lcfs-vm:/git-test# git commit -m "My initial commit" --author="A Genius <blah@linux.com>"

[master (root-commit) 48a9720] My initial commit

 Author: A Genius <blah@linux.com>

 1 file changed, 1 insertion(+)

 create mode 100644 somejunkfile

root@lcfs-vm:/git-test# get log

No command 'get' found, but there are 18 similar ones

get: command not found

root@lcfs-vm:/git-test# git log

commit 48a972083f324f322c02340231579f60a9ae4428

Author: A Genius <blah@linux.com>

Date:   Fri Oct 6 11:47:30 2017 -0700

    My initial commit

root@lcfs-vm:/git-test# 

Hi Luis, tengo esta salida cuandos doy git status

root@localhost git-test]# git status

On branch master

#

Initial commit

#

Untracked files:

(use "git add ..." to include in what will be committed)

#

somejunkfile

nothing added to commit but untracked files present (use "git add" to try

el objetivo del ejercicio cual es?

muchas gracias