Updates to identity docs.

docs/Identity.md

@@ -55,14 +55,20 @@ You can also set VAULT_TOKEN with the following command:
 export VAULT_TOKEN=$(vault login -token-only -method=userpass username="your-username")
 ```
 
-> **Note:** The `-token-only` is an equivalent of `-field=token -no-store` options.
-
-You can also use the following command to set VAULT_TOKEN and TOKEN_ACCESSOR:
+or a function like this:
 
 ```bash
-export TOKEN_ACCESSOR=$(vault token lookup -format=json | jq -r .data.accessor)
+function v_login() {
+    local VAULT_USERNAME=${1:-"your-username"}
+    vault login -format=json -method=userpass username="$VAULT_USERNAME" |
+        jq -r '.auth | [.client_token, .accessor] | @tsv' | read -r VAULT_TOKEN TOKEN_ACCESSOR
+    echo "Logged in as $VAULT_USERNAME (Token accessor: $TOKEN_ACCESSOR)"
+    export VAULT_TOKEN TOKEN_ACCESSOR
+}
 ```
 
+> **Note:** The `-token-only` is an equivalent of `-field=token -no-store` options.
+
 You can then use the `TOKEN_ACCESSOR` to look up token details without exposing the actual token.
 
 ```bash
@@ -96,3 +102,6 @@ Read user details:
 ```bash
 vault read auth/userpass/users/username
 ```
+
+## Entities and Groups
+