A useful script to identify Unity resource that are not referenced in the project

find_useless_resources_unity.sh

#!/bin/bash

GREEN='\033[0;32m'
RED='\033[0;31m'
YELLOW='\033[0;33m'
NC='\033[0m'

rm unused_files.log &> /dev/null

grep -r . --include=\*.meta --exclude=*{Editor,Gizmos}* -e 'guid' | while read line; do
  guuid=`echo $line | awk '{print $NF}'`
  path=`echo $line | cut -f1 -d":"`
  no_meta=`echo $path | sed "s/.meta$//"`
  # Skip if is directory
  if [[ -d $no_meta ]]; then
    continue
  fi

  filename=$(basename "$path")
  filename="${filename%.*}"

  echo -e "${GREEN}Currently searching for $guuid in $filename${NC}"
  grep -rn . --include=\*.{unity,anim,controller,prefab,mat} -e $guuid
  if [[ $? != 0 ]]; then
    echo $filename | grep .cs$ && is_script=$? || is_script=$?
    echo $filename | grep .unity$ && is_map=$? || is_map=$?

    if [[ $is_script == 0 ]]; then
      echo -e "${YELLOW}FILE $path not used directly, searching...${NC}"
      grep -rn . --include=\*.cs --exclude=$no_meta -e "${filename%.*}"
      if [[ $? != 0 ]]; then
        echo -e "${RED}FILE $path is unused!!!${NC}"
        echo $path >> unused_files.log
      fi
    elif [[ $is_map == 0 ]]; then
      echo -e "${YELLOW}FILE $path not used directly, searching...${NC}"
      grep ProjectSettings/EditorBuildSettings.asset -e `echo $no_meta | sed "s/^\.\///"`
      if [[ $? != 0 ]]; then
        echo -e "${RED}FILE $path is unused!!!${NC}"
        echo $path >> unused_files.log
      fi
    else
      echo -e "${RED}FILE $path is unused!!!${NC}"
      echo $path >> unused_files.log
    fi
  fi
done

Thanks for this.

It sounded awesome but unfortunately the only output I got from this was that every single .meta file in my project was not being used :(

Thanks! Worked for me.

I experienced the same problem as @mybadstudios but for me there was a reason and an easy fix:

If the script is simply applied to the whole project it will find no/few unreferenced objects because there might not needed demo scenes using the assets. Demo scenes should be removed first. Then the script can fin unused assets. After removing these the script was able to find now unused materials. After removing these the script was able to find now unused textures.

A three step process, but works like a charm.

Thanks for sharing!

Thanks for the code!

I'm pretty new to Unity. How do I use this code?

Any help is appreciated.