diff --git a/px6_convert.sh b/px6_convert.sh
index 6296c65..e2bd406 100755
--- a/px6_convert.sh
+++ b/px6_convert.sh
@@ -1,27 +1,27 @@
 #! /bin/bash
 
-INPUT=$1
-OUTPUT=$2
-export OW=$3
-export OH=$4
-W=$5
+INPUT="$1"
+OUTPUT="$2"
+export OW="$3"
+export OH="$4"
+W="$5"
 if [ "$OW" == "" ]; then OW=0; fi
 if [ "$OH" == "" ]; then OH=0; fi
 OPTIONS="-resize $W -set depth 8 -set colorspace RGB"
 
 #initial conversion
-convert-im6 $OPTIONS $INPUT txt:- | awk -v ow=$OW -v oh=$OH 'match($0, /^([0-9]*),([0-9]*):.*#([0-9A-Fa-f]{6,8}) +r/, arr ){ print "PX " arr[1]+ow " " arr[2]+oh " " arr[3] }' > $OUTPUT
+convert-im6 $OPTIONS "$INPUT" txt:- | awk -v ow=i"$OW" -v oh="$OH" 'match($0, /^([0-9]*),([0-9]*):.*#([0-9A-Fa-f]{6,8}) +r/, arr ){ print "PX " arr[1]+ow " " arr[2]+oh " " arr[3] }' > "$OUTPUT"
 
 echo optimizing >&2
 
 # edge detection
-convert-im6 $OPTIONS $INPUT -negate -edge 4 -negate txt:- | awk -v ow=$OW -v oh=$OH 'match($0, /^([0-9]*),([0-9]*):.*#000000/, arr ){ print "PX " arr[1]+ow " " arr[2]+oh " " }' > /tmp/px6_optimize
-grep -Ff /tmp/px6_optimize $OUTPUT >  ${OUTPUT}.tmp
-grep -Ff /tmp/px6_optimize $OUTPUT >> ${OUTPUT}.tmp
-grep -Ff /tmp/px6_optimize $OUTPUT >> ${OUTPUT}.tmp
-grep -Ff /tmp/px6_optimize $OUTPUT >> ${OUTPUT}.tmp
-cat ${OUTPUT}.tmp >> $OUTPUT
-cat $OUTPUT | grep -ve " [a-fA-F0-9]\{6\}00" | shuf > ${OUTPUT}.tmp
-mv ${OUTPUT}.tmp $OUTPUT
+convert-im6 $OPTIONS "$INPUT" -negate -edge 4 -negate txt:- | awk -v ow="$OW" -v oh="$OH" 'match($0, /^([0-9]*),([0-9]*):.*#000000/, arr ){ print "PX " arr[1]+ow " " arr[2]+oh " " }' > /tmp/px6_optimize
+grep -Ff /tmp/px6_optimize "$OUTPUT" >  "${OUTPUT}.tmp"
+grep -Ff /tmp/px6_optimize "$OUTPUT" >> "${OUTPUT}.tmp"
+grep -Ff /tmp/px6_optimize "$OUTPUT" >> "${OUTPUT}.tmp"
+grep -Ff /tmp/px6_optimize "$OUTPUT" >> "${OUTPUT}.tmp"
+cat "${OUTPUT}.tmp" >> "$OUTPUT"
+cat "$OUTPUT" | grep -ve " [a-fA-F0-9]\{6\}00" | shuf > "${OUTPUT}.tmp"
+mv "${OUTPUT}.tmp" "$OUTPUT"
 rm /tmp/px6_optimize
 
diff --git a/px6_send.sh b/px6_send.sh
index a9c8fc2..eee52cc 100755
--- a/px6_send.sh
+++ b/px6_send.sh
@@ -1,8 +1,8 @@
 #! /bin/bash	
-IP=$1
-PORT=$2
-PROCS=$3
-FILE=$4
+IP="$1"
+PORT="$2"
+PROCS="$3"
+FILE="$4"
 PROCMAXTIME=60
 
 MAINPID=$$
@@ -22,7 +22,7 @@ for i in $(seq 0 $(($PROCS-1))); do
 				THISPID2=$BASHPID
 				( sleep $PROCMAXTIME; kill -9 $THISPID2 >/dev/null 2>&1 ) &
 				echo "starting $(($i+1)) / $PROCS"
-				( while kill -0 $THISPID2; do cat $FILE; done ) | nc $IP $PORT >/dev/null 2>&1
+				( while kill -0 $THISPID2; do cat "$FILE"; done ) | nc "$IP" "$PORT" >/dev/null 2>&1
 			) >/dev/null 2>&1
 		done
 	) &