This is a single shell script that runs in bash, csh and a generic POSIX shell (e.g. /bin/sh) on both Linux and FreeBSD. It displays the current CPU model name and microcode version on any amd64 / x86_64 CPU. It does not have any dependencies other than what ships with the OS.

On Linux it can run as any user, on FreeBSD it requires root access to execute cpucontrol.

Example output on an AMD CPU on FreeBSD:

# csh getcpumicrocode.sh
AMD EPYC 7351 16-Core Processor
0x0800126e

Example output on an Intel CPU on Linux:

$ bash getcpumicrocode.sh
Intel(R) Xeon(R) CPU E5-2620 v3 @ 2.40GHz
0x44