Как заменить строку на новую через bash?

file=`cat file`
echo "------- file -------"
echo "$file"

template="'cluster' => 'Cluster',"
replaceTo="$template\\
'version' => '1.0'"

result=`echo "$file" | sed 's/'"$template"'/'"$replaceTo"'/g'`

echo "------- result -------"
echo "$result"

------- file -------
"server" => [
{
"port" => "2200",
"ntf_port" => "22000",
"ip" => "10.10.10.10",
'role' => 'Client',
'cluster' => 'Cluster',
'ntf_sync' => true,
}
------- result -------
"server" => [
{
"port" => "2200",
"ntf_port" => "22000",
"ip" => "10.10.10.10",
'role' => 'Client',
'cluster' => 'Cluster',
'version' => '1.0',
'ntf_sync' => true,
}

sed -i 's/^\x27cluster/x27 \x3D\x3E/^\x27Cluster/x27 \x3D\x3E/g' index.php