Install utilities for Ubuntu

temp.sh

#!/usr/bin/env bash


apt_install ()
{
    sudo apt-get -y install $1
}

apt_is_installed ()
{
    PKG_OK=$(dpkg-query -W --showformat='${Status}\n' $1 2>/dev/null | grep "install ok installed")
    if [[ "$PKG_OK" = "" ]]; then
        return 1
    else
        return 0
    fi
}

apt_is_available ()
{
    search_result=$(apt-cache search --names-only "^$1\$")

    if [[ "$search_result" = "" ]]; then
        return 1
    else
        return 0
    fi
}

packages="lightdm
lightdm-gtk-greeter
lightdm-gtk-greeter-settings
i3
wicd
ubuntu-drivers-common
mesa-utils
mesa-utils-extra
compton
xorg
xserver-xorg
nautilus
gnome-terminal
zsh"

for package in $packages
do
    echo "$package"
    INDENT='    '
    echo "${INDENT}checking if $package is installed"
    if apt_is_installed $package ; then
        echo "${INDENT}$package is already installed"
    else
        echo "${INDENT}$package is not already installed"
    	echo "${INDENT}checking if $package is available"

        if apt_is_available $package ; then
            echo "${INDENT}$package is available"
            echo "${INDENT}installing $package"
            apt_install $package
        else
            echo "${INDENT}$package is not available"
            exit 1
        fi
    fi
    echo
done

exit 0