Modify command to change git user's login shell

Author: jhhayashi

book/04-git-server/sections/setting-up-server.asc

@@ -94,11 +94,11 @@ $ which git-shell   # make sure git-shell is installed on your system.
 $ sudo vim /etc/shells  # and add the path to git-shell from last command
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-Now you can edit the shell for a user using `chsh <username>`:
+Now you can edit the shell for a user using `chsh <username> -s <shell>`:
 
 [source,console]
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-$ sudo chsh git  # and enter the path to git-shell, usually: /usr/bin/git-shell
+$ sudo chsh git -s $(which git-shell)
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 Now, the `git` user can only use the SSH connection to push and pull Git repositories and can't shell onto the machine.