System

Rundown: journalctl

See what the computer is doing 1journalctl -f Check your own user services: 1journalctl -f Follow the ssh daemon service 1journalctl -f -u sshd Find service errors in systemd since a date 1date=2027-01-01 2journalctl --since=${date} --grep="EXT4-fs error" Limit the systemd's journal size to 2 gigabytes 1journalctl …

Rundown: ntpd

1 min read · time system ntpd

Hard reset ntp service 1sudo ntpd -q -g -x -n

Rundown: ssh

1 min read · system comfy ssh

Get back terminal after ssh freezes remote machine 1<Return>~.

Rundown: sudo

1 min read · system users groups vipw sudo

Edit users in /etc/passwd directly 1sudo vipw You can't edit passwords without strange cyphers. Edit groups in /etc/group directly 1sudo vigr

Rundown: systemd

1 min read · system service boot systemd

List enabled systemd services 1systemctl list-unit-files --state enabled Check a service 1sudo systemctl status mpd Recognize service changes 1sudo systemctl daemon-reload Start a service (it stops when the computer shuts down) 1sudo systemctl taskd.service start 2sudo systemctl daemon-reload Find out why the computer …

Rundown: vipw

1 min read · system users groups vipw sudo

Edit users in /etc/passwd directly 1sudo vipw You can't edit passwords without strange cyphers. Edit groups in /etc/group directly 1sudo vigr

Setting an EDITOR

1 min read · system defaults

Programs expect a default 'line EDITOR' and 'VISUAL editor' so they know how you want to edit text. Add these lines to automatically set the variables in bash: 1echo 'export EDITOR=vim' >> ~/.bashrc 2echo 'export VISUAL=$EDITOR' >> ~/.bashrc Make the change system-wide by adding them to /etc/profile.d/custom.sh …

Setup Virtualbox

1 min read · system setup virtualization

Requirements Managing Groups Load the modules (or just reboot): 1su root 2modprobe vboxdrv 3vboxreload Make dd image into vdi 1VBoxManage convertdd base.dd output.vdi --format VDI If this doesn't work, try to make a new bite size with just 1sudo dd if=image.dd of=image2.dd bs=512 conv=sync Arch Linux 1pacman -S …

snaps

1 min read · system Ubuntu snap

sudo apt-get purge -y snapd

Store Host Password

2 min read · system ansible

Make a hosts file with one host (your computer) and one variable, just to test: 1hosts_file=hosts 2fort="$(fortune -s | head -1)" 3cowvar=cowsays 4 5echo "[cows] 6$HOSTNAME $cowvar='${fort}'" > "${hosts_file}" Now ansible should be able to show that '${cowvar}' in a debug message: 1ansible -i "$hosts_file" -m debug -a …