Update state after moving existing terraform resources to a module

terraform_resource_move.sh

#!/bin/bash

# 1. Fill in your module name
# 2. Run the terraform state mv commands from the output

# Pipeline steps:
# Generate plan
# Remove ANSI colour codes
# Generate state mv commands
# Strip any moves of numbered instances of a resource (i.e. from using count)

# Caveats:
# - Resources that use count will need to be moved manually (welcome improvements to oneliner to trim the indexes and generate a unique list of top-level resources :)

terraform plan 2>&1 | \
perl -pe 's/\e\[?.*?[\@-~]//g' | \
perl -ne 's/^\+ (module\.NEW_MODULE_NAME\.(.+))/terraform state mv \2 \1/ and print' | \
perl -ne '!/\.\d+$/ && print'

Nice! FYI that terraform plan has a -no-color option that should allow you to skip that second step.