Shell script `default/update'

Install packages updates

if command -v "apt-get" > /dev/null 2>&1; then sudo apt-get -q -o Dpkg::Use-Pty=0 update DEBIAN_FRONTEND=noninteractive sudo -E apt-get -q -y -o Dpkg::Use-Pty=0 -o DPkg::options::="--force-confdef" -o DPkg::options::="--force-confold" upgrade elif command -v "dnf" > /dev/null 2>&1; then sudo dnf -q -y update elif command -v "yum" > /dev/null 2>&1; then sudo yum -q -y update elif command -v "pkg" > /dev/null 2>&1; then pkg upgrade -q -y fi