diff --git a/bin/git-summary b/bin/git-summary
index cc77beb..58f1788 100755
--- a/bin/git-summary
+++ b/bin/git-summary
@@ -36,6 +36,8 @@ project=${PWD##*/}
 #
 
 date() {
+  # the $1 can be empty
+  # shellcheck disable=SC2086
   git log --pretty='format: %ai' $1 | cut -d ' ' -f 2
 }
 
@@ -44,6 +46,7 @@ date() {
 #
 
 active_days() {
+  # shellcheck disable=SC2086
   date $1 | sort -r | uniq | awk '
     { sum += 1 }
     END { print sum }
@@ -137,7 +140,7 @@ repository_age() {
 # list the last modified author for each line
 #
 single_file() {
-  while read data
+  while read -r data
   do
     if [[ $(file "$data") = *text* ]]; then
       git blame --line-porcelain "$data" 2>/dev/null | grep "^author\ " | LC_ALL=C sed -n 's/^author //p';
@@ -159,17 +162,6 @@ line_count() {
   lines | wc -l
 }
 
-result() {
-  lines | sort | uniq -c | sort -rn | awk '
-    { args[NR] = $0; sum += $0 }
-    END {
-      for (i = 1; i <= NR; ++i) {
-        printf " %s, %2.1f%%\n", args[i], 100 * args[i] / sum
-      }
-    }
-    ' | column -t -s,
-}
-
 # summary
 
 echo
@@ -181,9 +173,11 @@ if [ -n "$SUMMARY_BY_LINE" ]; then
   lines | sort | uniq -c | sort -rn | format_authors
 else
 
+  # shellcheck disable=SC2046
   echo " repo age :" $(repository_age)
-  echo " active   :"  $(active_days) days
-  echo " commits  :" $(commit_count)
+  # shellcheck disable=SC2086
+  echo " active   :"  "$(active_days $commit)" days
+  echo " commits  :" "$(commit_count)"
   if test "$commit" = ""; then
     echo " files    :" "$(file_count)"
   fi