Linux: Package Management

List installed packages:
dpkg -l

Update local database of packages (SystemUpdate will do this by itself):
apt-get update

Missing patches (full debug log - requires apt-get update first):
apt upgrade --dry-run 2>/dev/null | grep ^Inst

List missing patches (requires apt-get update first. To get the number of missing patches you can pass the output to wc -l):
	Security patches:
	apt upgrade --dry-run 2>/dev/null | grep ^Inst | grep \-security 
	
	Hotfixes:
	apt upgrade --dry-run 2>/dev/null | grep ^Inst | grep -v \-security