linux

Linux cheat sheet

  1. Gnome
  2. Utilities
  3. Bash multiple history files
  4. Vi(m)
  5. Multiple Dosbox configurations
  6. Writing

General

# Commandline options kernel was started with
cat /proc/cmdline

# Distribution version details
lsb_release -a

# Kernel details
uname -a

# Machine serial number
sudo dmidecode -s system-serial-number

# System log
journalctl --system -S "2024-03-22 14:00"

# add -no-tail when piping to something

# Get display details
edid-decode /sys/class/drm/card0-eDP-1/edid

# Memory (RAM) details
sudo lshw -C memory

# NVMe SSD details
sudo smartctl -a /dev/nvme0

# Block device e.g. disk details
lsblk

# CPU details
lscpu

# USB bus details
lsusb

# Firehose of hardware info
sudo hwinfo

# Service status
sudo systemctl status <service name>

# USe enable, start and stop to control services

# Sleep mode details
cat /sys/power/mem_sleep

# What the kernel should do after creating a hibernation image
cat /sys/power/disk

# Mask sleep states
sudo systemctl mask hibernate.target hybrid-sleep.target

# Examine masked states
sudo systemctl status sleep.target suspend.target hibernate.target hybrid-sleep.target

# Printers

lpstat -p -d
lpinfo -v
lp

# Current window manager
echo $XDG_CURRENT_DESKTOP

GRUB

# Edit GRUB configuration
sudo vi /etc/default/grub

# Write out GRUB configuration (Ubuntu)
sudo update-grub  

# If update-grub is not available
sudo grub2-mkconfig -o /boot/grub/grub.cfg

Local hostname resolution

(Allows machine to resolve devices on the LAN using <hostname>.local scheme.)
https://wiki.archlinux.org/title/avahi

mDNS is what enables this and the implementation for Linux is Avahi. Ubuntu installs this automatically, but other distros, like openSUsE don’t. The arch wiki page (linked above) is a great resource for setting it up yourself.

SSH

Reuse ssh connection (e.g. for rsync)

https://man.openbsd.org/ssh_config.5#ControlMaster

e.g.

# in ~/.ssh/config
ControlMaster auto
ControlPath ~/.ssh/control:%C
ControlPersist 5m

Package management

# Show details (including size) of a package
apt show X

Software I use

General

sudo apt install git flatpak simple-scan

Flatpaks

flatpak remote-add --if-not-exists flathub https://dl.flathub.org/repo/flathub.flatpakrepo

flatpak install flathub org.mozilla.firefox
flatpak install flathub io.github.dosbox-staging
flatpak install flathub net.sf.VICE

Flatpack commandlines

flatpak run --filesystem=/home/kghose/RetroComputing/dosbox io.github.dosbox-staging

flatpak run --filesystem=/home/kghose/RetroComputing/c64/ net.sf.VICE

flatpak run org.mozilla.firefox

Examine permissions

flatpak info --show-permissions org.mozilla.firefox
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