#!/bin/sh

# Beispiel für FreeBSD/macOS-nahe Erfassung

TOTAL=$(sysctl -n hw.memsize 2>/dev/null || sysctl -n hw.physmem)
PHYS=$(sysctl -n hw.physmem 2>/dev/null || echo "$TOTAL")
REAL=$(sysctl -n hw.realmem 2>/dev/null || echo "$PHYS")
PAGE_SIZE=$(sysctl -n hw.pagesize 2>/dev/null || echo 4096)
FREE_PAGES=$(sysctl -n vm.stats.vm.v_free_count 2>/dev/null || echo 0)
AVAILABLE=$((FREE_PAGES * PAGE_SIZE))

echo "
TOTAL: ${TOTAL}
PHYS: ${PHYS}
REAL: ${REAL}
AVAILABLE: ${AVAILABLE}
" | grep -Ev '^[[:space:]]*$' | awk '{a=$2; b="B"; if ($2 > 1024) {a=$2/1024; b="KiB"}; if ($2 > 1048576) {a=$2/1024^2; b="MiB"}; if ($2 > 1073741824) {a=$2/1024^3; b="GiB"}; printf "%s\t%s %s\n", $1,a,b}'