Run chmod 600 ~/.ssh/authorized_keys.
chmod 600 ~/.ssh/authorized_keys
Mission 129
Permissions checkpoint
Review modes, groups, ownership, and sensitive paths.
Permissions and usersstatchmodchgrptest
Lesson 129 of 360
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Permissions and users · 8 minutes
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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.
Run chgrp learners ~/.ssh/authorized_keys.
chgrp learners ~/.ssh/authorized_keys
Run test -f ~/.ssh/authorized_keys.
test -f ~/.ssh/authorized_keys
Run stat ~/.ssh/authorized_keys.
stat ~/.ssh/authorized_keys
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Lesson support
What to notice while you play.
Review modes, groups, ownership, and sensitive paths.
Run the commands in order and compare the outputs.
Junior operators build confidence by gathering evidence before changing systems.
- 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.
chmod <mode> <path>
Change a simulated numeric permission mode.
chgrp <group> <path>
Change a simulated file group label.
stat <path>
Show lab file details.