Mission 104

Existence checks

Use test to reason about files and directories.

Terminal basics
8 minutes Core Lesson 104 of 360
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learner@clairos:/home/learner $ Unix ops lab: type a command, press Enter
Instructions 8 minutes

Click any instruction for the command details, the why, and the common mistake to avoid.

Check file

Run test -f README.txt.

test -f README.txt
Check directory

Run test -d /etc.

test -d /etc
Inspect checked file

Run stat README.txt.

stat README.txt
Lesson support

What to notice while you play.

Objective

Use test to reason about files and directories.

Hint

Run the commands in order and compare the outputs.

Why it matters

Junior operators build confidence by gathering evidence before changing systems.

Common mistakes
  • Skipping the inspection step.
  • Assuming one command tells the whole story.
Reference

Commands in this lesson.

cat <file>

Print text file contents.

test -e|-f|-d <path>

Check path type in a training-friendly way.

stat <path>

Show lab file details.