## sample 5
### Authorize
Can User::bob view Photo:VacationPhoto94.jpg
Decision: Allow
```
cargo run authorize \
--policies policy.cedar \
--entities entity.json \
--request-json request.json
```
### Validation
Is `policy.cedar` valid based on the schema `schema.cedarschema`
```
cargo run validate \
--policies policy.cedar \
--schema schema.cedarschema
```
### Evaluate:
Evaluate a Cedar expression
```
cargo run evaluate \
--request-json request.json \
--entities entity.json \
"principal.addr.isLoopback()"
```