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Boot process
User admin
Storage
- disk partitioning
- ext4
- xfs
- LVM
- swap
- NFS & CIFS
- automounter
- storage commands
  - mount
  - query
    - ls
    - tree
    - du
    - df
    - file
    - ldd
    - stat
    - fuser
    - lslocks
  - search
    - find
    - locate
    - findfs
    - mountpoint
    - findmnt
    - namei
  - view and create
    - cat
    - tac
    - more
    - head
    - tail
    - touch
    - xfs_mkfile
    - fallocate
    - truncate
    - dd
    - ln
    - mkfifo
    - mknod
    - mktemp
    - mkdir
  - delete
    - rm
    - rmdir
    - unlink
    - shred
    - scrub
    - dd
  - attributes manipulation
    - chattr
    - lsattr
  - archival
    - tar
    - star
  - compression
    - compress
    - gzip
    - bzip2
  - other
    - rsync
    - blockdev
    - ssm
Network
- Network configuration
- SSH
- TCP wrappers
- DNS client
- VNC
- LDAP client
- time, chrony & ntp
  - timedatectl
  - date
  - hwclock
  - chrony
  - ntp
- networking tools
  - ip
  - networkctl
  - netstat
  - ss
  - address resolution
    - nslookup
    - host
    - dig
  - host alive?
    - ping
    - hping3
    - nmap
  - tracing routes
    - traceroute
    - tracepath
  - packet sniffing
  - netcat
  - messaging local users
Monitoring
Security
Miscellaneous
- scheduling
  - cron & anacron
  - at & batch
- logging
  - rsyslog
  - journal
  - logrotate
  - logger
  - dmesg
- patching
  - rpm
  - yum
  - dnf
- getting help
Cisco IOS

Boot process

Boot overview

Overview of the 4 different stages in a boot process: BIOS/UEFI, MBR/GTP + GRUB2, Kernel phase and systemd initialisation phase.

GRUB2

How to use and customise GRUB2 to our needs.

Kernel

Load, unload and query drivers. Query and tune kernel parameters.

systemd

The systemd daemon, its units and all the commands to manage it.

root password recovery

Two password-less ways of resetting the root password.

Filesystem Hierarchy Standard

Standard layout of Linux filesystems and directories.

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