an example znc install script

znc.sh

#! /usr/bin/env bash
#
#shellcheck source=sources/functions/utils
. /etc/swizzin/sources/functions/utils
#shellcheck source=sources/functions/os
. /etc/swizzin/sources/functions/os
#shellcheck source=sources/functions/app_port
. /etc/swizzin/sources/functions/app_port
#shellcheck source=sources/functions/ip
. /etc/swizzin/sources/functions/ip
#
username="$(_get_master_username)"                           # Get our main user name to use when bootstrapping filebrowser.
password="$(_get_user_password "${username}")"               # Get our main password name to use when bootstrapping filebrowser.
app_proxy_port="$(_get_app_port "$(basename -- "$0" \.sh)")" # Get our app port using the install script name as the app name
external_ip="$(_external_ip)"                                # Get our external IP
#
apt-get install -y build-essential libssl-dev libperl-dev pkg-config libicu-dev

cmake_version="$(git ls-remote -t --refs https://github.com/Kitware/CMake.git | awk '{sub("refs/tags/v", "");sub("(.*)(-alpha|-rc*)(.*)", ""); print $2 }' | awk '!/^$/' | sort -rV | head -n1)"
case "$(_os_arch)" in
	"amd64") app_arch="x86_64" ;;
	"armhf") app_arch="error" ;;
	"arm64") app_arch="aarch64" ;;
	*)
		echo_error "Arch not supported"
		exit 1
		;;
esac
cmake_url="https://github.com/Kitware/CMake/releases/download/v${cmake_version}/cmake-${cmake_version}-linux-${app_arch}.sh"

wget -qO "/tmp/cmake.sh" "${cmake_url}"
mkdir -p "/opt/cmake"
bash /tmp/cmake.sh --prefix="/opt/cmake" --skip-license

znc_version="$(git ls-remote -t --refs https://github.com/znc/znc.git | awk '{sub("refs/tags/", "");sub("(.*)(-alpha|-rc*)(.*)", ""); print $2 }' | awk '!/^$/' | sort -rV | head -n1)"

[[ -d /tmp/znc ]] && rm -rf /tmp/znc
git clone --no-tags --single-branch --branch "${znc_version}" --shallow-submodules --recurse-submodules -j"$(nproc)" --depth 1 https://github.com/znc/znc.git "/tmp/znc"
mkdir -p /tmp/znc/build
cd /tmp/znc/build

/opt/cmake/bin/cmake .. -DCMAKE_INSTALL_PREFIX="/opt/znc"
make -j"$(nproc)"
make install