Install (some of) the tools from Modern Unix

install-modern-unix.sh

#!/bin/bash
usage() {
    echo "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" |
        base64 --decode
}

update() {
    sudo apt-get update
}

# if no arguments provided
if [[ ${#} -eq 0 ]]; then
    echo "At least one argument is required." >&2
    echo "Try 'install-modern-unix.sh -h' for more information." >&2
    exit 1
fi

updated=false

# process the different options
while getopts ":abdfhlt" o; do
    case "${o}" in
    a) echo 'Creating aliases in ~/.bashrc' && echo 'alias ls="lsd" && alias cat="batcat" && alias du="duf"' | tee -a ~/.bashrc ;;
    b)
        if dpkg -s bat >/dev/null 2>&1; then
            echo "Package 'bat' already installed. Skipping."
        else
            echo 'Installing bat'
            if [ "$updated" = false ]; then
                update
                updated=true
            fi &&
                sudo apt-get install bat
        fi
        ;;
    d)
        if dpkg -s duf >/dev/null 2>&1; then
            echo "Package 'duf' already installed. Skipping."
        else
            echo "Installing duf - ARM version"
            mkdir modern-unix-install-duf-cache >/dev/null 2>&1 || {
                echo 'Error creating directory "modern-unix-install-duf-cache". Perhaps it already exists?' >&2
                exit 1
            } &&
                curl -sSL https://github.com/muesli/duf/releases/download/v0.6.2/duf_0.6.2_linux_arm64.deb -o ./modern-unix-install-duf-cache/a.deb &&
                sudo dpkg -i ./modern-unix-install-duf-cache/a.deb
            rm -r modern-unix-install-duf-cache
        fi
        ;;
    h) usage ;;
    l)
        if dpkg -s lsd >/dev/null 2>&1; then
            echo "Package 'lsd' already installed. Skipping."
        else
            echo "Installing lsd - ARM version"
            mkdir modern-unix-install-lsd-cache >/dev/null 2>&1 || {
                echo 'Error creating directory "modern-unix-install-lsd-cache". Perhaps it already exists?' >&2
                exit 1
            } &&
                curl -sSL https://github.com/Peltoche/lsd/releases/download/0.20.1/lsd_0.20.1_arm64.deb -o ./modern-unix-install-lsd-cache/a.deb &&
                sudo dpkg -i ./modern-unix-install-lsd-cache/a.deb
            rm -r modern-unix-install-lsd-cache
        fi
        ;;
    f)
        if dpkg -s fzf >/dev/null 2>&1; then
            echo "Package 'fzf' already installed. Skipping."
        else
            echo 'Installing fzf'
            if [ "$updated" = false ]; then
                update
                updated=true
            fi &&
                sudo apt-get install fzf
        fi
        ;;
    t) echo 'Installing tldr' && npm install -g tldr ;;
    \?)
        echo "install-modern-unix.sh: invalid option -- '$OPTARG'" &&
            echo "Try 'install-modern-unix.sh -h' for more information." >&2 &&
            exit 1
        ;;
    esac
done