Show current machine architecture

dpkg --print-architecture
It's built-in to the currently installed dpkg package.

Usage

use 'package:architecture', eg.

libc:i386
libc:amd64

只用'package'的话，安装的是current machine architecture

Add architecture

dpkg --add-architecture
apt-get update

dpkg architectures are stored in file /var/lib/dpkg/arch

Ref

• https://wiki.debian.org/Multiarch/HOWTO#What_is_this_Multiarch.3F

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to be continued