lscpu

What it does

How to write it

lscpu [OPTION]...

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$ run as a normal user# run as root (or with sudo)

1. 1CPU overview

   $lscpu
   Architecture:             x86_64
   CPU(s):                   2
   Model name:               Intel Xeon Processor (Icelake)
   Hypervisor vendor:        KVM

   Plus sockets, cores, caches, flags.

2. 2Cores and threads

   $lscpu | grep -E '^(CPU\(s\)|Thread|Core|Socket)'

   CPUs = sockets × cores × threads.

3. 3Is this a VM?

   $lscpu | grep -i hypervisor
   Hypervisor vendor:        KVM

   No line = physical machine.

4. 4Can it run VMs?

   $lscpu | grep -i virtualization

   VT-x or AMD-V needed for KVM.

5. 5CPU security mitigations (security)

   $lscpu | grep -i vulnerab
   Vulnerability Spectre v2:  Mitigation; Enhanced / Automatic IBRS

   "Vulnerable" lines need a kernel or microcode update.

6. 6Per CPU table

   $lscpu -e

   Which CPU is on which core and socket.

7. 7Caches

   $lscpu -C

   L1, L2, L3 sizes.

8. 8JSON for inventory

   $lscpu -J | jq -r '.lscpu[] | select(.field=="Model name:") | .data'

   Model for an asset list.

9. 9CPU flags (like AES or AVX)

   $lscpu | grep -o -w -E 'aes|avx2|avx512f' | sort -u

   Does the CPU support hardware AES?

10. 10Compare with nproc

    $nproc; lscpu | grep '^CPU(s)'

    nproc = usable now, lscpu = present.

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