Security requirements demand that no secrets appear in the shell history.

The command that does not meet the security requirement of not having secrets appear in the shell history is B. vault kv put secret/password value-itsasecret. This command would store the secret value “itsasecret” in the key/value secrets engine at the path secret/password, but it would also expose the secret value in the shell history, which could be accessed by other users or malicious actors. This is not a secure way of storing secrets in Vault.

The other commands are more secure ways of storing secrets in Vault without revealing them in the shell history. A. generate-password | vault kv put secret/password value would use a pipe to pass the output of the generate-password command, which could be a script or a tool that generates a random password, to the vault kv put command, which would store the password in the key/value secrets engine at the path secret/password. The password would not be visible in the shell history, only the commands. C. vault kv put secret/password value=@data.txt would use the @ syntax to read the secret value from a file named data.txt, which could be encrypted or protected by file permissions, and store it in the key/value secrets engine at the path secret/password. The file name would be visible in the shell history, but not the secret value. D. vault kv put secret/password value-SSECRET_VALUE would use the -S syntax to read the secret value from the environment variable SECRET_VALUE, which could be set and unset in the shell session, and store it inthe key/value secrets engine at the path secret/password. The environment variable name would be visible in the shell history, but not the secret value.