diff --git a/bin/generationlib b/bin/generationlib
old mode 100644
new mode 100755
index c94367c..6f860b2
--- a/bin/generationlib
+++ b/bin/generationlib
@@ -114,11 +114,12 @@ if [ $# -eq 0 ]; then #  must be at least one arg
     exit 1
 fi
 
-while getopts "j:i:o:hc:" OPT; do # "j:" waits for an argument "h" doesnt
+while getopts "j:i:k:o:hc:" OPT; do # "j:" waits for an argument "h" doesnt
     case $OPT in
     h)  echo "$USAGE"
         exit 0 ;;
     j)  MAX_NPROC=$OPTARG ;;
+    k)  CHECKFILE=$OPTARG ;;
     c)  CFG_FILENAME=$OPTARG ;;
     o)  OUTDIR=$OPTARG ;;
     i)  INPUT_FILENAME=$OPTARG ;;
@@ -138,20 +139,25 @@ do
     echo $i
     ID=`echo "$i" | sed -e 's/;.*//g'`
     PIC_NAME=`echo "$i" | sed -e 's/.svg/.jpg/g'`
-    echo PID
-	RESIZE="${width}x${height}"
-    SWITCHES="-density $density $INPUT_FILE/$ID -resize $RESIZE $INPUT_FILE/$PIC_NAME"
-    CMDLINE="$CMD $SWITCHES"
-    echo $CMDLINE
-    (echo $ID; $CMDLINE) &
+    FILE_PATH=$INPUT_FILE/$PIC_NAME
+    if [ -s $FILE_PATH ]
+        then
+            echo $PIC_NAME exists!
+        else 
+            RESIZE="${width}x${height}"
+            SWITCHES="-density $density $INPUT_FILE/$ID -resize $RESIZE $INPUT_FILE/$PIC_NAME"
+            CMDLINE="$CMD $SWITCHES"
+            echo $CMDLINE
+            (echo $ID; $CMDLINE) &
  
-    PID=$!
-    queue $PID
+            PID=$!
+            queue $PID
  
-    while [ $NUM -ge $MAX_NPROC ]; do
-        checkqueue
-        sleep 0.5
-    done
+            while [ $NUM -ge $MAX_NPROC ]; do
+                checkqueue
+                sleep 0.5
+            done
+    fi
 done
  
 wait # wait for all processes to finish before exit