Initial Core 2 study project

labs/OS-4-command-line-lab.md

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+# Lab OS-4: Command-Line Troubleshooting
+
+Domain:
+- 1.0 Operating Systems
+
+Works on:
+- Windows
+- Linux
+
+Does not require:
+- macOS
+
+## Goal
+
+Build comfort entering commands and interpreting basic troubleshooting output.
+
+## Windows Steps
+
+Run:
+
+```powershell
+hostname
+whoami
+winver
+ipconfig
+ipconfig /all
+ping 127.0.0.1
+nslookup example.com
+netstat -ano
+sfc /scannow
+ipconfig /?
+```
+
+Record:
+- Computer name:
+- Current user:
+- Windows version/build:
+- IPv4 address:
+- Default gateway:
+- DNS server:
+- Loopback ping successful:
+- DNS lookup successful:
+- One active/listening port:
+- SFC result:
+
+## Linux Steps
+
+Run:
+
+```bash
+hostname
+whoami
+ip addr
+ping -c 4 127.0.0.1
+df -h
+ps aux
+top
+```
+
+Press `q` to exit `top`.
+
+Record:
+- Hostname:
+- Current user:
+- IP address:
+- Root filesystem free space:
+- One running process:
+
+## Safety Notes
+
+Do not run destructive disk commands in this lab.
+
+Know these for the exam, but do not experiment casually:
+- `format`
+- `diskpart`
+- `robocopy` with mirror/delete options
+- `chkdsk /f` or `chkdsk /r` on important disks without planning
+
+## What You Should Learn
+
+- `ipconfig /all` gives detailed IP configuration.
+- `ping` tests reachability.
+- `nslookup` tests DNS.
+- `netstat -ano` shows connections, ports, and process IDs.
+- `sfc /scannow` repairs protected Windows system files.
+- `/?` shows command help.
+