diff --git a/src/deforaos-git-hook.sh b/src/deforaos-git-hook.sh
index 0ac0581..4a48973 100755
--- a/src/deforaos-git-hook.sh
+++ b/src/deforaos-git-hook.sh
@@ -21,6 +21,10 @@
 PROGNAME="deforaos-git-hook.sh"
 #executables
 GIT="git"
+SED="sed"
+SORT="sort"
+UNIQ="uniq"
+WC="wc"
 
 
 #functions
@@ -97,9 +101,9 @@ _hook_update()
 		#count the number of commits
 		commit_cnt=$((commit_cnt + 1))
 	done
-	all_files=$(echo "$all_files" | sed -e '/^$/d')
-	files_cnt=$(echo "$all_files" | wc -l)
-	unique_files_cnt=$(echo "$all_files" | sort | uniq | wc -l)
+	all_files=$(echo "$all_files" | $SED -e '/^$/d')
+	files_cnt=$(echo "$all_files" | $WC -l)
+	unique_files_cnt=$(echo "$all_files" | $SORT | $UNIQ | $WC -l)
 	if [ -n "$branch" ]; then
 		if [ $commit_cnt -eq 1 -a -n "$message" ]; then
 			echo "$repository: $author [$branch] $message ($files_cnt alterations in $unique_files_cnt files)"