Excellent software and practical tutorials

A Linux command to check the router CPU chip architecture
How to check the CPU chip architecture of Linux processor? Is the CPU 32-bit or 64-bit? What are arm and mips?
The first step to flash the router firmware is to understand what the router's CPU is, and then find the corresponding version of the firmware to flash it.
For example: Install v2ray software on a router. v2ray is not universal for the entire system. It also distinguishes between CPU chips.