Linux lab
chmod calculator
Toggle read, write and execute per class and read the octal mode and ls -l string together.
Each digit is the sum of r=4, w=2 and x=1 for one class. On a directory, x is what lets you enter it and reach anything inside, so r or w without x is almost never what you want.
Learn the concept
The lesson this lab comes from, with the explanation, a practice task and a quiz.
More labs
All labs- CloudIAM policy evaluatorEvaluate AWS IAM policies against a request and trace why it is allowed or denied.
- SecurityThreat model explorerWalk a data-flow diagram, find the trust-boundary crossings and apply STRIDE to each flow.
- KubernetesNetworkPolicy reachabilityApply Kubernetes NetworkPolicies and see which Pods can still reach which.