Update OS evals

evaluation_examples/examples/os/a462a795-fdc7-4b23-b689-e8b6df786b78.json

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+{
+  "id": "a462a795-fdc7-4b23-b689-e8b6df786b78",
+  "snapshot": "os",
+  "instruction": "Could you please help me to switch to the user 'Charles' with password of 'Ex@mpleP@55w0rd!'?",
+  "source": "https://ubuntu.com/tutorials/command-line-for-beginners#5-moving-and-manipulating-files",
+  "config": [
+    {
+      "type": "execute",
+      "parameters": {
+        "command": "echo password | sudo -S su - charles"
+      }
+    }
+  ],
+  "trajectory": "trajectories/",
+  "related_apps": [
+    "os"
+  ],
+  "evaluator": {
+    "func": "exact_match",
+    "result": {
+      "type": "vm_command_line",
+      "config": {
+        "command": "if [ '$(whoami)' = 'charles' ]; then echo 'Current user is charles.'; else echo 'Current user is not charles'; fi"
+      }
+    },
+    "expected": {
+      "type": "rule",
+      "rules":{
+        "expected": "Current user is charles"
+      }
+    }
+  }
+}