Linux under the Hood April 2021

[root@localhost ~]# history
    1  ls
    2  ls -l
    3  cat > myfifo
    4  ssh sander@192.168.50.131
    5  ssh sander@192.168.50.136
    6  cd /boot
    7  ls -l
    8  lsmod
    9  lsmod | wc
   10  lspci
   11  ssh sander@192.168.50.136
   12  man capabilities
   13  man setpriv
   14  cd
   15  yum install -y git
   16  git clone https://github.com/sandervanvugt/luth
   17  cd luth
   18  ls
   19  ./countdown 12
   20  lspci -k
   21  modinfo e1000
   22  cd /proc
   23  man proc
   24  yum search kernel-doc
   25  yum install -y kernel-doc
   26  rpm -ql kernel-doc
   27  cd /usr/share/doc/kernel-
   28  cd /usr/share/doc/kernel-doc-4.18.0/
   29  ls
   30  cd Documentation/
   31  ls
   32  cd  sysctl/
   33  ls
   34  cd
   35  cd /proc
   36  ls
   37  cd 6903
   38  ls
   39  cat cmdline
   40  ls
   41  cat status
   42  ls
   43  cd fd
   44  ls
   45  ls -l
   46  firefox &
   47  firefox
   48  ps aux | grep firef
   49  cd ../../44084
   50  ls
   51  cd fd
   52  ls -l
   53  kill -9 44084
   54  pwd
   55  cd ../..
   56  cd /
   57  cd
   58  man signals
   59  man signal
   60  man 7 signal
   61  cd /proc
   62  ls
   63  top
   64  ls
   65  less meminfo
   66  ls
   67  cd sys
   68  ls
   69  cd kernel/
   70  ls
   71  cat pid_max
   72  ip a
   73  cd /proc/sys/net/
   74  ls
   75  cd ipv6/
   76  ls
   77  cd conf/
   78  ls
   79  cd all
   80  ls
   81  cat disable_ipv6
   82  echo 1 > disable_ipv6
   83  ip a
   84  cd ..
   85  pwd
   86  cd ../..
   87  ls
   88  cd core/
   89  ls
   90  pwd
   91  cat rmem_max
   92  cd ../..
   93  pwd
   94  cd vm
   95  ls
   96  cat swappiness
   97  pwd
   98  echo 70 > swappiness
   99  cat swappiness
  100  vim /etc/sysctl.conf
  101  sysctl -a
  102  sysctl -a | wc
  103  cd
  104  cd /sys
  105  ls
  106  cd kernel/
  107  ls
  108  cd ..
  109  cd bus
  110  ls
  111  cd cpu/
  112  ls
  113  cd devices/
  114  pwd
  115  ls
  116  lspcu
  117  lscpu
  118  ls cpu0/
  119  cat cpu0/online
  120  echo 0 > cpu0/online
  121  lscpu
  122  echo 1 > cpu0/online
  123  cd /sys/block/
  124  ls
  125  cd sda
  126  ls
  127  cd queue/
  128  ls
  129  pwd
  130  cat scheduler
  131  echo none > scheduler
  132  cat scheduler
  133  cd
  134  ssh sander@192.168.50.136
  135  cd luth/
  136  ./countdown 12
  137  ldd $(which passwd)
  138  cd
  139  echo hello
  140  mkfifo myfifo
  141  cat myfifo
  142  systemctl list-units
  143  systemctl list-unit-files
  144  systemctl list-unit-files | grep cups
  145  systemctl cat cups.path
  146  busctl list
  147  cd luth/
  148  ls
  149  cat dbus-commands.sh
  150  qdbus --system --literal org.freedesktop.NetworkManager
  151  dbus --system --literal org.freedesktop.NetworkManager
  152  qdbus --system --literal org.freedesktop.NetworkManager
  153  yum provides */qdbus
  154  yum install -y qt5-qttools-5.12.5-2.el8.x86_64
  155  qdbus --system --literal org.freedesktop.NetworkManager
  156  /usr/lib64/qt5/bin/qdbus --system --literal org.freedesktop.NetworkManager
  157  cat dbus-commands.sh
  158  dbus-send --system --print-reply             --dest=org.freedesktop.NetworkManager             /org/freedesktop/NetworkManager             org.freedesktop.DBus.Properties.Get             string:"org.freedesktop.NetworkManager"             string:"NetworkingEnabled"
  159  dbus-send --system --print-reply             --dest=org.freedesktop.NetworkManager             /org/freedesktop/NetworkManager             org.freedesktop.DBus.Properties.Get             string:"org.freedesktop.NetworkManager"             string:"ActiveConnections"
  160  nmcli con show
  161  vim dbus-commands.sh
  162  cat dbus-commands.sh
  163  dbus-send --system --print-reply             --dest=org.freedesktop.NetworkManager             /org/freedesktop/NetworkManager/ActiveConnection/3             org.freedesktop.DBus.Properties.Get             string:"org.freedesktop.NetworkManager.Connection.Active"             string:"Devices"
  164  monit
  165  yum provides */monit
  166  dnf install -y epel-release
  167  dnf provides */monit
  168  dnf install -y monit
  169  monit --help
  170  monit
  171  ls -l $(which yum)
  172  rpm -qa | grep core
  173  git clone git://git.sv.gnu.org/coreutils
  174  cd coreutils/
  175  ls
  176  cd src
  177  ls
  178  less cat.c
  179  history
  180  cd
  181  less /boot/System.map-4.18.0-240.el8.x86_64
  182  cd luth/
  183  ./countdown 12
  184  monit
  185  systemctl status monit
  186  kill -9 47699
  187  monit
  188  uname -r
  189  cat /etc/hosts
  190  strace cat /etc/hosts
  191  strace -c cat /etc/hosts
  192  man mmap
  193  man 2 intro
  194  man 2 syscalls
  195  man 3 intro
  196  ls -l /dev/sd*
  197  rm /dev/sda
  198  fdisk /dev/sda
  199  ls -l /dev/sd*
  200  mknod --help
  201  mknod /dev/sda b 8 0
  202  ls -l /dev/sd*
  203  chgrp disk /dev/sda
  204  chmod 660 /dev/sda
  205  ls -l /dev/sd*
  206  cd /sys
  207  ls
  208  cd devices/
  209  ls
  210  cd system/
  211  ls
  212  cd memory/
  213  ls
  214  cd /sys
  215  ls
  216  cd block/
  217  ls
  218  ls -l
  219  cat sda
  220  cd sda
  221  ls
  222  cd
  223  udevadm info --query=all --name=/dev/sda
  224  history
  225  history | grep ssh
  226  ssh sander@192.168.50.136
  227  dmsetup ls
  228  mount
  229  mount | grep ext
  230  power
  231  poweroff
  232  lsblk
  233  mkfs.ext4 /dev/sdb
  234  mount /dev/sdb /mnt
  235  cp /etc/a* /mnt
  236  ls -il /mnt
  237  debugfs /dev/sdb
  238  history