Use subkey tool to find polkadot / kusama / other substrate network's accounts from mnemonic seed words, passwords, and derivation paths.

check_substrate_address.sh

#!/bin/bash

# Use this script to try various derivation paths and passowords for a known seed.
# ****NOTE!!!!**** 
# DO NOT SAVE THIS FILE WITH YOUR SEED IN IT!!!!
# INSTEAD RUN THIS ONCE AS IS, THEN MANALLY SET 

# YOU MUST EDIT THESE VARIABLES *NOT IN THIS FILE*!! 
# SET THESE IN YOUR TERMINAL:
# SECRET="<put your seed words / mnemonic here>"
# PASSWORD="<put your password here, could be empty, so just quotes "">"

# Set your *real* variables like this in your terminal ONLY. 
# Don't save your secrets here in the file!!!

# ---------------------------------- BEGIN SCRIPT ----------------------------------

echo "------------------------------"
echo "                                   *** Address finder ***                                     "
echo "*** A Script using the \`subkey\` to search for your address over various derivation paths ***"
echo "------------------------------"

echo "*****"
echo "First check your seed words show up in the BIP39 list"
echo "https://github.com/bitcoin/bips/blob/master/bip-0039/english.txt"
echo "If there are words that you have recorded that are *not* in this list,"
echo "you should look for what you might have had mistaken!"
echo "all valid words are in this list!"
echo "*****"

# subkey needs to be installed.
if ! command -v subkey &> /dev/null
then
    echo "Command subkey not found!! You must install this first."
    echo "Instructions and instaliation found here:"
    echo "https://substrate.dev/docs/en/knowledgebase/integrate/subkey"
    exit
fi

# TODO: Do a check for existing *shell* (not env) variables, otherwise use a default for testing.
# https://www.baeldung.com/linux/bash-variables-export
# for now, we need them to exist in the env (exported)
if [[ -z "${SECRET}" ]]; then
  echo "SECRET phrase / mnemonic not set! Using default for test: \"increase dust illegal pottery half kite broccoli force cheese miss arrange cushion\""
  SECRET="increase dust illegal pottery half kite broccoli force cheese miss arrange cushion"
  echo "To set your secret, use \`export SECRET=\"<put your secret here>\"\`"
  echo "Then re-run this script"
else
  echo "!! Found user set SECRET phrase / mnemonic !!"
#   echo $SECRET
fi

if [[ -z "${PASSWORD}" ]]; then
  echo "PASSWORD not set! Using default: \"\""
  PASSWORD=""
  echo "To set your password, use \`export PASSWORD=\"<put your password here>\"\`"
  echo "Then re-run this script"
else
  echo "!! Found user set PASSWORD !!"
#   echo $PASSWORD
fi

if [[ -z "${NETWORK}" ]]; then
  echo "NETWORK not set! Using default: \"polkadot\""
  NETWORK="polkadot"
  echo "To set your network, use \`export NETWORK=\"<put your network here>\"\`"
  echo "Then re-run this script"
else
  echo "!! Found user set NETWORK !!"
#   echo $NETWORK
fi

if [[ -z "${ADDRESS}" ]]; then
  echo "ADDRESS not set! Using default: \"13KsHzKyUtHaXQNjzcPGk17wFzbyzkogwgRoEKYftrL8e7vV\""
  ADDRESS="13KsHzKyUtHaXQNjzcPGk17wFzbyzkogwgRoEKYftrL8e7vV"
  echo "To set your address, use \`export ADDRESS=\"<put your address here>\"\`"
  echo "Then re-run this script"
else
  echo "!! Found user set ADDRESS !!"
#   echo $ADDRESS
fi

echo "------------------------------"
echo "Running search for "$ADDRESS" in with provided information various derivation paths"
echo "...If nothing found, there will be no output..."
echo "------------------------------"

# *************************************************
# NOTE: edit these to try other paths!!
# *************************************************

# try with no path or password
subkey inspect --network $NETWORK "$SECRET" | grep -B4 $ADDRESS
# try with only password
subkey inspect --network $NETWORK "$SECRET///$PASSWORD" | grep -B4 $ADDRESS

# loop over various derivation paths
# parity signer uses a few: https://github.com/paritytech/parity-signer/blob/master/src/constants/networkSpecs.ts
# see the `pathId` variable
for i in "" 0 1 2 3 4 polkadot kusama kusama_dev centrifuge edgeware kulupu substrate_dev rococo westend
  do subkey inspect --network $NETWORK "$SECRET//$i///$PASSWORD"; 
done | grep -B4 $ADDRESS

for i in "" 0 1 2 3 4 polkadot kusama kusama_dev centrifuge edgeware kulupu substrate_dev rococo westend
  do for j in 0 1 2 3 4;
    do subkey inspect --network polkadot "$SECRET//$i//$j///$PASSWORD"
  done
done | grep -B4 $ADDRESS

for i in "" 0 1 2 3 4 polkadot kusama kusama_dev centrifuge edgeware kulupu substrate_dev rococo westend
  do for j in 0 1 2 3 4
    do for k in 0 1 2 3 4
      do subkey inspect --network $NETWORK "$SECRET//$i//$j//$k///$PASSWORD"
    done
  done
done | grep -B4 $ADDRESS

# Get more help if needed
echo "------------------------------"
echo "Search Complete! If nothing found above, try to edit the script for various other derivation paths."
echo "Need more help? Look for support: https://support.polkadot.network/support/home"
echo "------------------------------"
echo "BE SURE TO CLEAR YOUR BASH HISTORY NOW!!! run:"
echo "history -c"
echo "More infor here: https://linuxhint.com/clear_bash_history/"