Dangerous: chown -R nobody:nogroup /home

Dangerous

chown -R nobody:nogroup /home

linux · bash · Intermediate

Reassigns ownership of every user's home directory to the unprivileged nobody account. Users lose control of their own files, SSH refuses keys whose ownership looks wrong, and the original ownership is not recorded anywhere.

Signals to notice

Recursive ownership change across all users
Breaks SSH key permission checks
Original ownership is unrecoverable

Think you can spot these under time pressure?

Start Training

More File System

rm ./build/output.logIntermediate
chmod +x ./scripts/deploy.shIntermediate
sudo rm -rf / --no-preserve-rootIntermediate
sudo rm -rf /var/lib/mysqlIntermediate
mkfs.ext4 /dev/sda1Intermediate
dd if=/dev/zero of=/dev/sda bs=1MIntermediate