Mission 124

Test file types

Check file and directory types before changing modes.

Permissions and users
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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 key file

Run test -f ~/.ssh/authorized_keys.

test -f ~/.ssh/authorized_keys
Check SSH directory

Run test -d ~/.ssh.

test -d ~/.ssh
Inspect key metadata

Run stat ~/.ssh/authorized_keys.

stat ~/.ssh/authorized_keys
Lesson support

What to notice while you play.

Objective

Check file and directory types before changing modes.

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.

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

Check path type in a training-friendly way.

stat <path>

Show lab file details.