Linux+ Study Vault

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Side Channel Commands • Cheats • PBQs

Core Commands

Quick Cheat Sheet

Permissions:
  rwx = 7, rw- = 6, r-x = 5, r-- = 4
  chmod 755 file  →  rwxr-xr-x
  chown user:group file

Systemd:
  systemctl status service
  systemctl restart service
  systemctl enable service

Filesystems:
  lsblk                       # list block devices
  mkfs.ext4 /dev/sdb1         # make ext4 filesystem
  mount /dev/sdb1 /mnt/data   # mount device
  /etc/fstab                  # persistent mounts

Networking:
  ip a            # interfaces
  ip r            # routes
  ss -tulnp       # listening sockets
  ping 8.8.8.8    # connectivity
  dig example.com # DNS lookup

Logs:
  journalctl -xe
  journalctl -u sshd
  tail -f /var/log/syslog

PBQ Tasks

Fix /srv/share so user alice owns it (rw for owner, r for others).
Mount /dev/sdb1 on /mnt/data using ext4.
Restart sshd and confirm status is “active (running)”.
Show lines with “ERROR” in /var/log/syslog.
List listening TCP ports with PIDs.

Try commands: ls, cd, pwd, chmod 755 /srv/share, chown alice:alice /srv/share, mount /dev/sdb1 /mnt/data, systemctl restart sshd, systemctl status sshd, grep ERROR /var/log/syslog, ss -tulnp, help.