Why Auto-Grading Terminal Commands Requires State Checks, Not String Matching

A developer building an auto-grader for terminal tasks found that comparing typed commands as strings failed because multiple valid commands can achieve the same result. A second approach using regex to parse command output also proved unreliable for the same reason. The solution was to evaluate the simulated filesystem or process state after task completion, regardless of which command was used. This state-based grading logic was implemented in JavaScript and now powers the Lab module of ShellPer, a terminal learning application. The approach offers a more accurate and flexible way to assess whether a terminal task was completed correctly.