Docs | Splint.rs

groff

Basic Documents Great a file called name.ms, with the following content: 1.TL 2Groff-Time 3.AU 4Ghost 5.NH 6How to Format Groff Documents. 7.PP 8Groff needs two new lines to show a new paragraph. Then make a pdf from the document with: groff -ems name.ms -Tpdf > name.pdf The commands must be placed at the start of a …

hard links

1 min read · basics links

A hard link is one file which exists in multiple locations. Each file has an ID, which is kept on the hard disk's partition. Each hard link has the same ID, because they are the same file. This ID is called the 'inode'. Create a file, and a hard link: 1fortune > $file_1 2mkdir -p x/y/z/ 3ln $file_1 x/y/z/$file_2 Have a …

How to Learn `vim`

1 min read · vim learning

Uninstall vim. Install vi. Write a few blog posts. The ancient wisdom is correct - everyone should start with vi. But the standard wisdom fails to mention writing. So people just 'try to remember', then they edit a couple of configuration files with vim, then stop, because it's a pain to think about keystrokes while …

ijq

1 min read · data json TUI

Analyse json easier with ijq. 1column -J -ts: -H PW,GID,shell -N User,PW,UID,GID,Description,Home,shell /etc/passwd > host.json 2ijq !$ If you get stuck, try adding .[].

imagemagick

2 min read · vision

Convert jpg to png. 1magick image.jpg image.png 1magick image.jpg -quality 50 image.jpg 'Quality' must be from 1 to 100. 1magick -resize 50% image.jpg image2.jpg Resizing only changes jpegs. Change a png with: 1magick input.png png8:out.png Invert Colours 1magick input.jpg output.jpg -negate Make Images Smaller 1magick …

Install Arch

2 min read · arch

Keyboard layout changed. 1ls /usr/share/kbd/keymaps/**/*.map.gz 1loadkeys uk.map.gz Check if boot mode is UEFI 1ls /sys/firmware/efi/efivars Without efivars, the system must boot with BIOS. Check network's up 1ping archlinux.org Set system clock properly 1timedatectl set-ntp true Check disks 1lsblk Make partition …

Install yay

1 min read · distros arch

1pacman --sync --noconfirm --needed base-devel gcc git 2git clone https://aur.archlinux.org/yay.git /tmp/yay 3makepkg -C !$ -si The flags are mostly the same as in pacman. But running yay without flags will do the update like yay -Syu and with package name it will search packages in the AUR and pacman repos, and let …

Interactive String Substitution

1 min read · data vim substitution

Want to find and replace, but also confirm each instance? 1vim -c "%s/${pattern}/${replacement}/gc" -c 'wq' ${file} Notice that double-quotes (") in the first command (-c). Alternatively, check with an example string: 1sed "s/${pattern}/ARGLEBARGLE/g" ${file} | grep 'ARGLEBARGLE'

IP Addresses with Recfiles

1 min read · data recfiles games

Download the Database Download the csv data, and separate the ipv4 data from the ipv6. 1curl -Lo ips.zip 'https://www.kaggle.com/api/v1/datasets/download/ipinfo/ipinfo-country-asn' 2unzip -p ips.zip country_asn.csv | csv2rec | recsel -e "start_ip ~ '.'" > ipv4.rec 3unzip -p ips.zip country_asn.csv | csv2rec | recsel …

iptables

2 min read · networking

Intro This is a basic Linux firewall program. Look at your firewalls: 1iptables -L We see the output of input, output and forwarding rules. Forward I don't need any forwarding, so I'm going to drop all forwarding: 1iptables -P FORWARD DROP Input Let's 'A'dd, or 'A'ppend a rule with -A. Let's drop all input from a …