Show the details of x86 cpu flags found in /proc/cpuinfo.

cpufeatures_x86.sh

#!/usr/bin/env bash

function have_command ()
{
  type "$1" >& /dev/null
}

function get_local_features ()
{
  grep ^flags /proc/cpuinfo \
  | head -n1 \
  | tr [:lower:] [:upper:] \
  | awk '{for(i=3;i<=NF;i++)print $i;}'
}

function get_features_definition ()
{
  local cmd
  if   have_command wget; then
    cmd=( wget -qO- )
  elif have_command curl; then
    cmd=( curl -o - )
  fi
  "${cmd[@]}" http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/plain/arch/x86/include/asm/cpufeatures.h \
  | grep -E "^#define +X86_FEATURE_" \
  | sed -r -e 's/\t/ /g' -e 's:.* X86_FEATURE_([^ ]*).*/\* *(.*?) *\*/.*$:\1\t\2:g'
}

function make_query ()
{
  awk '{printf("%s^%s\t", sep, $0);sep="|"}'
}

get_features_definition \
| grep -E "$(get_local_features | make_query)" \
| awk -v FS="\t" '{printf("%-18s %s\n", $1, $2);}'