Run sha256sum README.txt.
sha256sum README.txt
Mission 40
Checksums
Use deterministic training hashes to verify file identity.
Files and pathssha256sumcat
Lesson 40 of 360
0/360 lessons
0/17 missions
Files and paths · 7 minutes
New learnerrank
0XP
0%complete
learner@clairos:/home/learner $
Unix ops lab: type a command, press Enter
Instructions
7 minutes
Click any instruction for the command details, the why, and the common mistake to avoid.
Run sha256sum /etc/hostname.
sha256sum /etc/hostname
Run cat /home/learner/data/checksums.txt.
cat /home/learner/data/checksums.txt
Save progress
Keep learning across sessions.
Create a free account to sync completed lessons, XP, streaks, course status, and your next lesson across sessions.
Checking account status...
Progress sync is idle.
0XP
New learnerrank
0day streak
0best streak
0daily streak
0lessons
0courses
0missions
0tasks
Noverified
Progress sync stores completion IDs, scores, streaks, badges, and game settings. Terminal contents, editor snippets, lab scratch, email, and real names are never published on leaderboards or share cards.
Lesson support
What to notice while you play.
Read and generate simple training checksums.
Run sha256sum on README and hostname.
Checksums help verify downloads, backups, and scripts.
- Treating a hash as encryption.
- Comparing only file names instead of content.
Reference
Commands in this lesson.
cat <file>
Print text file contents.
sha256sum <file>
Print a deterministic training checksum.