Linux under the Hood sept23

  685  ls -l /dev/
  686  ls -l /dev/nvme*
  687  cat /proc/devices | grep 240
  688  cat /proc/devices | grep 259
  689  lsblk
  690  rm /dev/sda6
  691  lsblk
  692  rm /dev/sda3
  693  rm /dev/sda1
  694  mount | grep sda1
  695  umount /boot
  696  mount /boot
  697  ls -l /dev/sda
  698  ls -l /dev/sda*
  699  mknod --help
  700  mknod /dev/sda1 b 8 1
  701  ls -l /dev/sda*
  702  chgrp disk /dev/sda1
  703  chmod 660 /dev/sda1
  704  mount /boot
  705  ps aux | grep udev
  706  mount -a | grep sysfs
  707  mount -a | grep sys
  708  mount | grep sys
  709  cd /sys/block/sda/queue/
  710  ls
  711  cat scheduler
  712  pwd
  713  cd /usr/lib/udev/rules.d/
  714  ls
  715  pwd
  716  lsblk
  717  lsusb
  718  udevadm info --attribute-walk --name=/dev/sdb
  719  pwd
  720  cd /etc/udev/rules.d/
  721  vim 99-deny-sandisk.rules
  722  udevadm control --reload-rules
  723  udevadm monitor
  724  lsblk
  725  udevadm info --attribute-walk --name=/dev/sdb | less
  726  vim 99-deny-sandisk.rules
  727  udevadm control --reload-rules
  728  udevadm monitor
  729  lsblk
  730  ls /run/media/student/B80D-54CA/
  731  lsmod | grep usb
  732  vim 99-deny-sandisk.rules
  733  udevadm control --reload-rules
  734  ls /dev/sd*
  735  dnf install usbguard
  736  dnf install usbutils udisks2
  737  systemctl enable --now usbguard.service
  738  usbguard list-devices
  739  lsusb
  740  usbguard reject-device 4
  741  usbguard list-rules
  742  lsusb
  743  lsblk
  744  usbguard generate-policy > /etc/usbguard/rules.conf
  745  systemctl enable --now usbguard
  746  usbguard list-rules
  747  udevadm monitor
  748  lsblk
  749  usbguard list-devices
  750  lsusb
  751  pwd
  752  ls -lrt
  753  reboot
  754  cd rhcsa/
  755  ./countdown 12
  756  cd /dev
  757  ls -l s*
  758  ls -l cdrom
  759  lsblk
  760  ls -l sda* nvm*
  761  less /proc/devices
  762  cd
  763  xxd -l 512 /dev/sda
  764  ls /sys/firmware/
  765  ssh student@192.168.29.161
  766  lsblk
  767  fdisk /dev/sdb
  768  dmsetup create hidden --table '0 204800 linear /dev/sdb 1845248'
  769  ls /dev/mapper/
  770  mkfs.ext4 /dev/mapper/hidden
  771  mkdir /hidden
  772  mount /dev/mapper/hidden /hidden
  773  cd /hidden
  774  echo secret > secret.txt
  775  lsblk
  776  reboot
  777  lsblk
  778  fdisk /dev/sdb
  779  dmsetup create hidden --table '0 204800 linear /dev/sdb 1845248'
  780  mount /dev/mapper/hidden /hidden
  781  ls /hidden
  782  cd rhcsa/
  783  history
  784  less /proc/meminfo
  785  free -m
  786  top
  787  less /proc/cpuinfo
  788  top
  789  less /proc/meminfo
  790  cd /proc/sys/
  791  ls
  792  cd vm
  793  ls
  794  echo 2 > drop_caches
  795  less /proc/meminfo
  796  top
  797  man proc
  798  free -m
  799  echo 3 > /proc/sys/vm/drop_caches
  800  free -m
  801  sysctl -a
  802  sysctl -a | grep -i dirty
  803  cat dirty_expire_centisecs
  804  less /proc/meminfo
  805  reboot
  806  free -m
  807  less /proc/meminfo
  808  vmstat 2 50
  809  top
  810  df -h
  811  dd if=/dev/zero of=/swapfile bs=1M count=1024
  812  chmod 0600 /swapfile
  813  mkswap /swapfile
  814  swapon /swapfile
  815  free -m
  816  echo 80 > /proc/sys/vm/swappiness
  817  free -m
  818  reboot
  819  top
  820  reboot
  821  free -m
  822  top
  823  reboot
  824  top
  825  dmesg
  826  echo -400 > /proc/$(pidof gnome-shell)/oom_score_adj
  827  top
  828  echo f > /proc/sysrq-trigger
  829  slabinfo
  830  slabinfo | less
  831  history