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| # Linux kernel | ||
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| | Commands | What it does | | ||
| |:--------:|:------------:| | ||
| | sudo update-initramfs -c -k *kernelversion* | Generate a new initramfs image with version | | ||
| | sudo kernelstub -a "maxcpus=2" | Support disabling cores in the BIOS | | ||
| | sudo kernelstub -a "nvme_core.default_ps_max_latency_us=####" | [Change NVMe wake-up times](https://wiki.archlinux.org/title/Solid_state_drive/NVMe#Power_Saving_(APST)) | | ||
| | sudo kernelstub -a "intel_idle.max_cstate=4" | [Change Intel C-State Level](https://www.kernel.org/doc/html/latest/admin-guide/pm/intel_idle.html) | | ||
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| # Xorg (X11) | ||
| | Commands | What it does | | ||
| |:--------:|:------------:| | ||
| | xset -dpms | [Disable Monitor power saving](https://wiki.archlinux.org/title/Display_Power_Management_Signaling) | | ||
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| # systemd | ||
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| | Commands | What it does | | ||
| |:--------:|:------------:| | ||
| | systemctl --failed | List failed systemd units | | ||
| | systemctl --failes --all | List all failed services in systemd | | ||
| | systemctl --user -t target | See what systemd targets are running | | ||
| | systemctl --user list-dependencies default.target | See if the default target wants a user service | | ||
| | systemctl enable multi-user.target --force | Make multi-user target available in a normally graphical OS | | ||
| | systemctl get-default | Get current runlevel | | ||
| | systemctl isolate graphical.target | Switch to gui mode, runlevel 5 | | ||
| | systemctl isolate multi-user.target | Switch to server mode (runlevel 3), no gui | | ||
| | bluetooth.service | Show dependencies systemctl list-dependencies | | ||
| | systemctl list-timers -a | List all timers | | ||
| | systemctl list-unit-files | Shows all services, sockets, timers, and sockets | | ||
| | systemctl list-unit-files --type=service | List systemd service files | | ||
| | systemctl list-units | Show running units | | ||
| | systemctl list-units --type=service --state=active | systemd services currently active | | ||
| | systemctl list-units --type=service --state=running | systemd services currently active and running | | ||
| | systemctl set-default graphical.target | Change the default systemd startup mode to a gui | | ||
| | systemctl set-default multi-user.target | Change the default systemd startup mode to a terminal only | | ||
| | systemctl suspend | Suspend computer | | ||
| | systemctl hibernate | Hibernate computer | | ||
| | systemctl reboot --boot-loader-entry=Pop_OS-oldkern.conf | Boots to the oldkern, can be changed to match another entry like Windows or Recovery | | ||
| | systemctl reboot --boot-loader-entry=help | List all boot entries for systemd-boot | | ||
| | systemctl reboot --firmware-setup | Restarts the system into BIOS | | ||
| | systemctl restart name.service | Restart a service like bluetooth.service or apache2.service | | ||
| | systemctl status name.service | See what is going on with a service | | ||
| | systemctl status --no-pager | Show tree of processes | | ||
| | systemd-analyze plot > boot_analysis.svg | Create a graphic of the boot time and process | | ||
| | systemd-resolve –status | List network info like DNS Servers | | ||
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| ## systemd v251+ (in Ubuntu 22.10+) | ||
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| | Commands | What it does | | ||
| |:--------:|:------------:| | ||
| | bootctl set-timeout TIMEOUT | Sets the boot loader menu timeout in seconds | | ||
| | bootctl set-timeout-oneshot TIMEOUT | Set the boot loader menu timeout only for the next boot | | ||
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| # systemd v249 (Pop!_OS 22.04/Ubuntu 22.04) | ||
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| | Commands | What it does | | ||
| |:--------:|:------------:| | ||
| | bootctl set-default ID | Sets the new boot device/target | | ||
| | bootctl set-oneshot ID | Sets the new boot device/target for only the next boot | | ||
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| # efibootmgr | ||
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| | Commands | What it does | | ||
| |:--------:|:------------:| | ||
| | efibootmgr | List boot entries | | ||
| | sudo efibootmgr -n #### | Sets that boot entry for the next boot only | | ||
| | sudo efibootmgr -N #### | Deletes the boot next | | ||
| | sudo efibootmgr --timeout=5 | Add a 5 second timeout to boot | | ||
| | sudo efibootmgr -b #### -B | Remove boot entry matching the #### | | ||
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| # GRUB | ||
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| | Commands | What it does | | ||
| |:--------:|:------------:| | ||
| | sed -i 's/^GRUB_CMDLINE_LINUX_DEFAULT="/&option /' /etc/default/grub | adds kernel option to GRUB file | | ||
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| > *NOTE:* you will need to run this command when making changes to GRUB's file before rebooting: | ||
| ```bash | ||
| sudo update-grub | ||
| ``` | ||
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| ## fwupd | ||
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| | Commands | What it does | | ||
| |:--------:|:------------:| | ||
| | fwupdmgr get-devices | List devices supported by fwupd | | ||
| | fwupdmgr get-updates | Perform updates to devices supported by fwupd | | ||
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| https://wiki.archlinux.org/title/fwupd | ||
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| ## Ubuntu/Pop | ||
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| ### apt/dpkg | ||
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| | Commands | What it does | | ||
| |:--------:|:------------:| | ||
| | apt policy packagename | Package information | | ||
| | apt-cache madison packagename | List available versions for a package | | ||
| | sudo apt install packagename –dry-run | See what packages will be installed with the package | | ||
| | apt policy packagename | Find version installed and available | | ||
| | sudo dpkg --remove --force-remove-reinstreq package_name | Remove broken package | | ||
| | sudo apt-mark hold packagename | Hold a package to the current version | | ||
| | dpkg --list | grep linux-image | List all installed kernels | | ||
| | apt list --installed | grep packagename | Searches that package if it was installed using apt | | ||
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| # sed | ||
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| ## Arch | ||
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| ### pacman | ||
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| | Commands | What it does | | ||
| |:--------:|:------------:| | ||
| | pacman -Syu | updates repos then upgrades packages | | ||
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| | Commands | What it does | | ||
| |:--------:|:------------:| | ||
| | pkgfile filename | files what package provides that file | | ||
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| # [flatpak](https://docs.flatpak.org/en/latest/using-flatpak.html) | ||
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| | Commands | What it does | | ||
| |:--------:|:------------:| | ||
| | flatpak update | Update flatpak packages | | ||
| | flatpak list | Show the installed flatpak packages | | ||
| | flatpak search | Search flatpak packages from sources | | ||
| | flatpak remotes | List Flatpak remotes (other servers) | | ||
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| # Plasma | ||
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| | Commands | What it does | | ||
| |:--------:|:------------:| | ||
| | kioclient exec path/to/desktop/file | Runs the .desktop file | | ||
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| # GNOME | ||
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| ## GSettings | ||
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| | Commands | What it does | | ||
| |:--------:|:------------:| | ||
| | gsettings set com.system76.hidpi enable false | Turn off HiDPI daemon | | ||
| | gsettings set org.gnome.desktop.interface scaling-factor 2 | Change scaling for the UI | | ||
| | gsettings set com.ubuntu.user-interface.desktop cursor-size 48 | Enlarge cursor | | ||
| | gsettings set org.gnome.desktop.background picture-uri 'file://PathToImage' | Change wallpaper | | ||
| | gsettings set org.gnome.desktop.wm.preferences button-layout "appmenu:minimize,maximize,close" | Enable Minimize and Maximize buttons | |