diff --git a/cutAndShrinkVideo b/cutAndShrinkVideo
index bd421be..ac0bb23 100755
--- a/cutAndShrinkVideo
+++ b/cutAndShrinkVideo
@@ -1,10 +1,16 @@
 #!/bin/bash
 
-cutFile="$(cutVideo $1 $2 $3)"
+if [ "$#" -ne 3 ]; then
+  echo "USAGE: $0 FILE START DURATION"
+  exit 1  
+fi
+
+cutFile="$(cutVideo "$1" "$2" "$3")"
+echo "cutFile=$cutFile"
 status=$?
 
 if [ $status -eq 0 ]; then
-  echo "$(shrinkVideo $cutFile)"
+  echo "$(shrinkVideo "$cutFile")"
   status=$?
   if [ $status -eq 0 ]; then
     rm "$cutFile"
diff --git a/cutVideo b/cutVideo
index 1f62da9..db0f8d0 100755
--- a/cutVideo
+++ b/cutVideo
@@ -2,11 +2,12 @@
 
 if [ "$#" -ne 3 ]; then
   echo "USAGE: $0 FILE START DURATION"
+  exit 1
 fi
 
 fullpath="$1"
-dir=`dirname $fullpath`
-filename=`basename $fullpath`
+dir=`dirname "$fullpath"`
+filename=`basename "$fullpath"`
 extension="${filename##*.}"
 filename="${filename%.*}"
 outfile="$dir/$filename""Cut.$extension"
diff --git a/shrinkVideo b/shrinkVideo
index 68f1ed4..ba3de25 100755
--- a/shrinkVideo
+++ b/shrinkVideo
@@ -2,11 +2,12 @@
 
 if [ "$#" -ne 1 ]; then
   echo "USAGE: $0 FILE"
+  exit 1
 fi
 
 fullpath="$1"
-dir=`dirname $fullpath`
-filename=`basename $fullpath`
+dir=`dirname "$fullpath"`
+filename=`basename "$fullpath"`
 filename="${filename%.*}"
 outfile="$dir/$filename""Shrunk.mp4"