install pv if absent

pv_install.sh

#!/usr/bin/env bash

if [[ "$OSTYPE" == "darwin"* ]] ; then
    if  ! brew ls --versions pv &> /dev/null ; then
        echo "Pipe Viewer is NOT installed!"
        brew install pv
    fi
else
    distro=$(source /etc/os-release && echo "$NAME");

    if [[ $distro == *"Debian"* ]] || [[ $distro == *"Ubuntu"* ]]; then
        if  ! dpkg -l | grep -qw pv &> /dev/null ; then
            echo "Pipe Viewer is NOT installed!"
            apt-get update -y
            apt-get install -y pv
        fi
    elif [[ $distro == *"Manjaro"* ]]; then
        echo "what package manager?"
    else
        echo "Pipe View package must be installed for your system: $distro"
        exit 1
    fi
fi