Get rid of awk, use nproc

Change-Id: Id873981724fc431a38763059955a21b14d59e553
diff --git a/GettingStarted.md b/GettingStarted.md
index a02f08e..322b91d 100644
--- a/GettingStarted.md
+++ b/GettingStarted.md
@@ -28,7 +28,7 @@
 
 ```
 repo init -u sso://spacepark/manifest -m debian.xml
-repo sync -j$(lscpu |awk '/^CPU\(s\):/ { print $2 }')
+repo sync -j$(nproc)
 ```
 
 After a short wait, you'll be ready to go for making changes to the repository
@@ -50,7 +50,7 @@
 
 ```
 mm debootstrap make-bootstrap-tarball
-m -j$(lscpu |awk '/^CPU\(s\):/ { print $2 }')
+m -j$(nproc)
 ```
 
 In about an hour, if the tip of the tree is good, you should have images ready