Easier way to create AUTHOR file

Author: pmiossec

book/09-git-and-other-scms/sections/import-tfs.asc

@@ -17,11 +17,18 @@ You can get this information from the `tf` command-line client, like so:
 
 [source,powershell]
 ----
-PS> tf history $/myproject -recursive | cut -b 11-20 | tail -n+3 | uniq | sort > AUTHORS
+PS> tf history $/myproject -recursive > AUTHORS_TMP
 ----
 
-This grabs all of the changesets in the history of the project.
-The `cut` command ignores everything except characters 11-20 from each line (you'll have to experiment with the length of the fields to get these numbers right).
+This grabs all of the changesets in the history of the project and put it in the AUTHORS_TMP file that we will process to extract the data of the 'User' column (the 2nd one).
+Open the file and find at which characters start and end the column and replace, in the following command-line, the parameters `11-20` of the `cut` command with the ones found:
+
+[source,powershell]
+----
+PS> cat AUTHORS_TMP | cut -b 11-20 | tail -n+3 | uniq | sort > AUTHORS
+----
+
+The `cut` command keeps only the characters between 11 and 20 from each line.
 The `tail` command skips the first two lines, which are field headers and ASCII-art underlines.
 The result of all of this is piped to `uniq` to eliminate duplicates, and saved to a file named `AUTHORS`.
 The next step is manual; in order for git-tfs to make effective use of this file, each line must be in this format: