Hishicorp for storing private key

Hi, I would like to use HashiCorp to store the private key for an Ethereum wallet (UTC, deterministric wallet). My question is probably an faq. When I read the private key from the vault to use it in a script, this is of course visible, at least to the linux user running the script. Which are the other measure that I should put in place to be sure that the private key is not compromised? Thanks