diff --git a/src/reversing/bh_replacestring.sh b/src/reversing/bh_replacestring.sh
index a8a505f..dbc792d 100644
--- a/src/reversing/bh_replacestring.sh
+++ b/src/reversing/bh_replacestring.sh
@@ -5,11 +5,12 @@ bh_replacestring() {
     local src="$2"
     local dst="$3"
 
-    local srchex=$(echo $src | xxd -pu)
-    local dsthex=$(echo $dst | xxd -pu)
+    local srchex=$(echo "$src" | xxd -pu)
+    local dsthex=$(echo "$dst" | xxd -pu)
 
-    local tmpfile=".$(cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 16 | head -n 1)"
+    local tmpfile=$(mktemp)
 
-    xxd -p < $fil | tr -d '\n' | sed "s/${srchex::-2}/${dsthex::-2}/g" | xxd -r -p > $tmpfile
-    cat $tmpfile > $fil && rm -f $tmpfile
+    xxd -p $fil | tr -d \\n | sed "s/${srchex::-2}/${dsthex::-2}/g" | xxd -rp >  $tmpfile
+    
+    [[ -s $tmpfile ]] && mv $tmpfile $fil
 }