Linux Fundamentals
Environment Variables and Shell Startup
Diagnose Linux environment and shell-startup problems by comparing the actual user, process, PATH, shell mode, and launch mechanism.
Linux Fundamentals lessonLinuxPractice
UNTIMED COACHING
Practice before the pressure
Use feedback to correct the model, not merely memorize an option position.
GUIDED PRACTICE
Practice the lesson questions
Answer normal lesson questions without a timer. Every answer includes an explanation, and incorrect answers can be tried again before continuing.
- 20 questions balanced across the lesson's key topics
- At least four explanatory diagrams or tables
- Retry freely, without a timer or score
COMMAND EVIDENCE
Inspect the process environment before editing startup files
Read the command together with the observable result. The full Learn section explains what this evidence proves and what it does not prove.
$ printf 'user=%s\ncwd=%s\n' "$(id -un)" "$PWD"
user=ana
cwd=/srv/reporting
$ command -v report-sync
/home/ana/.local/bin/report-syncCONCEPT MODELS
See the lesson as a system
Use these visual guides to connect the key ideas before answering the questions.