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Linux users/groups/permissions cheatsheet

Add user

sudo useradd -m peter
sudo passwd peter

groupadd myAppUsers

sudo usermod -a -G peter myAppUsers

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Running docker images cheatsheet

Download a docker image

Download the image called debian:

docker pull debian

Create a container (and start it)

The container in the samples will be named "debby"

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alias la="ls -a"

mkcd() {
    mkdir $1 && cd $1
}

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// Returns a new array, with the element at pos replaced with replacement item or calling the replacement function on arr[pos]
function changeAtIndex(arr, pos, replacement) {
	if (typeof replacement == "function") {
		replacement = replacement(arr[pos]);
	}

	return [...arr.slice(0, pos), replacement, ...arr.slice(pos + 1)];
}

// Returns a new array, with the first element matching the predicate function replaced with replacement item or calling the replacement function on arr[pos]

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{
	"console.log(\"***\", ...)": {
		"prefix": "conso",
		"scope": "javascript,typescript,typescriptreact",
		"body": [
			"console.log(\"*** $1\", $0)",
			""
		]
	},
	"debug-map":{

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const {
    chain,
    filter,
    count,
    groupBy,
    map
} = require("./chaining")


const transforms = [

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public abstract record StronglyTypedId<TValue>(TValue Value)
	where TValue : notnull
{
	public override sealed string ToString() => $"{Value}";
}

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How to add a new disk in Linux

This post takes you through creating a partition, formatting it and finally mount it in the filesystem.

These procedures where tested on Linux Mint 19

List disks and partitions

$ sudo fdisk -l

The result will vary depending on the number of disk you have. On my computer I got these three entries:

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[alias]
        refresh = !git fetch --all --prune && git checkout master && git pull --rebase && git lastbranch
        amend = commit --amend --no-edit
        lastbranch = checkout @{-1}
        ql = log -10 --oneline --decorate --graph
        qb = "!qb(){ git refresh && git checkout -b aei/PPN-$@; }; qb"
        qc = "!qc(){ git checkout aei/PPN-$@; }; qc"
        qa = "!qa(){ git refresh && git branch --remote | grep $@ | sed 's/origin\\///' | xargs git checkout && git pull --rebase && git rebase master; }; qa"

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function round(value, precision) {
  return Number(Math.round(value + "e" + precision) + "e-" + precision)
}


function strictCompare(left, right) {
  console.log(`strictCompare(${left}, ${right})`);
  return left === right;
}