There's a simple way in bolt to run commands from a file Show archive.org snapshot without caring about BASH escaping:

# /home/user/foo.sh
echo "$(hostname -f): $(uptime)"
echo "${USER}"

echo "${SERVERLIST}" | bolt command run @foo.sh --run-as root --targets -

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Use script run Show archive.org snapshot to run a ruby script:

#!/usr/bin/env ruby
# /home/user/bar.rb

puts 'Hello, world!'

echo "${SERVERLIST}" | bolt script run ./bar.rb  --targets -