diff --git a/encode_all b/encode_all
index 75dbd0f..7f490ed 100755
--- a/encode_all
+++ b/encode_all
@@ -8,8 +8,8 @@ function ts() {
   date '+%Y-%m-%d_%H:%M'
 }
 
-overwrite_all=true
-# overwrite_all=false
+# overwrite_all=true
+overwrite_all=false
 debug_only=false
 # debug_only=true
 
@@ -20,12 +20,12 @@ logdir="${HOME}/encoding_logs"
 start_ts="$(ts)"
 log="${logdir}/${start_ts}_encoding_log"
 fixes="${logdir}/${start_ts}_fixes.sh"
+temp_dir="$(mktemp -d)"
 
 printf '#!/bin/bash\n# FIXES generated by library_works/encode_all\n\n' > "$fixes"
 
 function encode() {
   file="$1"
-
   # file is full original path + filename
   src_dir="$(dirname "$file")"
   file_name="$(basename "$file")"
@@ -34,6 +34,8 @@ function encode() {
                 -e 's/\.flac$/.opus/' \
                 -e "s_${HOME}/flac_${HOME}/opus_" <<< "$file")"
 
+  sum="$(sha256sum <<< "$final_opus" | cut -d\  -f1)"
+  printf '%s\n' "$final_opus" > "$temp_dir/$sum"
   if [[ -f "$final_opus" && "$overwrite_all" == 'false' ]]; then
     printf '%s exists, not reencoding\n' >> "$log"
     return
@@ -146,4 +148,12 @@ function encode() {
   fi
 }
 
+echo going to process
 find "$src_library" -type f -name '*.flac' -print0 | env_parallel -P 0 -0 --bar encode {}
+echo done processing
+
+diff -d --suppress-common-lines <(cat "$temp_dir"/* | sort -V) <(find "$output_dir" -type f | sort -V) | grep -E '^>' | sed 's/^> //' | while read old_opus; do
+  rm -f "$old_opus"
+done
+
+find "$output_dir" -empty -type d -delete
diff --git a/test.sh b/test.sh
new file mode 100644
index 0000000..6b9dc2a
--- /dev/null
+++ b/test.sh
@@ -0,0 +1,18 @@
+#!/bin/bash
+
+unset a
+declare -a a
+c=0
+function t() {
+  c+=1
+  a+=(bly $c)
+}
+
+
+for i in {1..10}; do
+  t
+done
+
+for i in "${a[@]}"; do
+  echo $i
+done