diff --git a/README.md b/README.md
index 3215799..055837b 100644
--- a/README.md
+++ b/README.md
@@ -66,7 +66,7 @@ Mercurial, suddenly we are less able to share our code with other
 people.  Communication between subteams of an organization is hurt.
 You can't collaborate as well.  Either you find yourself emailing
 individual files around (yuck!), making a special repo with just
-the files needed by your collaborators (yuck!), or just deciding that
+the files needed by your collaborators (yuck!!), or just deciding that
 collaboration isn't worth all that effort (yuck!!!).
 
 The ability to be open and transparent about our code, with the
diff --git a/tools/confidence_test.sh b/tools/confidence_test.sh
index 10ca5ed..cd3d7f4 100755
--- a/tools/confidence_test.sh
+++ b/tools/confidence_test.sh
@@ -64,17 +64,26 @@ function assert_file_md5hash() {
 function assert_file_group() {
   local file="$1"
   local wanted="$2"
+  local found
   assert_file_exists "$file"
 
   case $(uname -s) in
+    Darwin|FreeBSD )
+      found=$(stat -f '%Sg' $file)
+      ;;
+    Linux )
+      found=$(stat -c '%G' $file)
+      ;;
     CYGWIN* )
       echo "ASSERT_FILE_GROUP: Running on Cygwin. Not being tested."
       return 0
       ;;
+    * )
+      echo 'ERROR: Unknown OS. Exiting.'
+      exit 1
+      ;;
   esac
 
-  local found=$(ls -lg "$file" | awk '{ print $3 }')
-  # NB(tlim): We could do this with 'stat' but it would break on BSD-style OSs.
   if [[ "$wanted" != "$found" ]]; then
     echo "ASSERT FAILED: $file chgrp wanted=$wanted found=$found"
     exit 1
@@ -286,9 +295,9 @@ DEFAULT_GID_NAME=$(id -gn)
 # Pick a group that is not the default group:
 TEST_GID_NUM=$(id -G | fmt -1 | tail -n +2 | grep -xv $(id -u) | head -n 1)
 TEST_GID_NAME=$(python -c 'import grp; print grp.getgrgid('"$TEST_GID_NUM"').gr_name')
-echo DEFAULT_GID_NAME=$DEFAULT_GID_NAME
-echo TEST_GID_NUM=$TEST_GID_NUM
-echo TEST_GID_NAME=$TEST_GID_NAME
+echo "DEFAULT_GID_NAME=$DEFAULT_GID_NAME"
+echo "TEST_GID_NUM=$TEST_GID_NUM"
+echo "TEST_GID_NAME=$TEST_GID_NAME"
 
 PHASE 'Bob postdeploys... default.'
 blackbox_postdeploy