Update shell/Readme.md

Improve wording in `cp` file backup example.

diff --git a/shell/Readme.md b/shell/Readme.md
index 1961f4a9ab266cd311cd18ead324326b46df62f8..b152152761ce86adccaee453624f36b008e3069e 100644 (file)
--- a/shell/Readme.md
+++ b/shell/Readme.md
@@ -563,8 +563,9 @@ experimental data file from gerdal that contains the number 4.
 ## Creating, moving, copying, and removing
 
 We've created a file called `all_data` using the redirection operator
-`>`. This is critical file so we have to make copies so that the data
-is backed up. Lets copy the file using the `cp` command. The `cp`
+`>`. This file is critical - it's our analysis results - so we want to
+make copies so that the data is backed up.
+Lets copy the file using the `cp` command. The `cp`
 command backs up the file. Navigate to the `data` directory and enter:
 
     cp all_data all_data_backup