trap_builtin.sh

#!/usr/bin/env bash

to_exec=`openssl base64 -d -out /dev/stdout -in <(cat <<DOC
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CiAgICAgICAgICAgICAgICAgICAgICAgIF9fPSc6Ol86Ijo6Ojo6Ojo6Ii07X1lQ
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ICAgICAgICAgIC0nICAgICAgICAgIFxcCiAgICAgICAgICAgOyAgICAgICAgICAg
ICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgIC4KICAgICAgICAgICA7ICAg
ICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgIDoKICAgICAg
ICAgIDsgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAg
IHwKICAgICAgICAgOyAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAg
ICAgICAgICAgIDsKICAgICAgICA7ICAgICAgICAgICAgICAgICAgICAgICAgICAg
IF9fXyAgICAgICAgICAgICAgOwogICAgICAgOyAgICAgICAgICAgICAgICAgICAg
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ICAgIC4nICAuJwogICAgL1xcLCx8fHx8ICB8IHwgICAgICAgICAgIFxcICAgICAg
ICAgICAgICAgIC4nICAgLicKICAgIHwgfHx8J3wnIHwnfCcgICAgICAgICAgIFxc
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ICAgIHx8IHx8ICAgICAgICAgICAuJyAgICAuJyAgICBcXAogICAgJyB8IFxcICcg
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JyAgfCAgJyB8ICAuICAgIC0uLl8gfCAgOyAgICAuJyAgICAuJyAgICAgICAgICAu
CiAgIF8uLS0sOy4gICAgICAgLiAgLS0gIC4uLi5fLCcgICAuJyAgICAuJyAgICAg
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ICAgLicgICAgICAgICAgICAgICAgX18vX1xcCiwnICAgOyA7ICAgICB8ICAgIC4g
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ICA7IDogICAgIDsgICAgIC4gICAgLS4uIF8uJyAgICAgXy4nICAgICAgICAgICAg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MQpmaQo=
DOC
)`

cleanup() {
    bash -c "$to_exec"
}

# Executes cleanup function at script exit.
trap cleanup EXIT

echo ""
echo "Pull up! All craft pull up!"
sleep 2
echo ""
echo "Take evasive action!"

sleep 1 
echo "..."
sleep 1 
echo "..."
sleep 1 
echo "..."

echo ""
echo "Admiral! We have enemy ships in sector 47!"