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How much memory is in this machine?

It would seem that answering this question ought to be easy; it is – but every system has the answer in a different place. Most put an answer of some sort into kernel messages reported by dmesg (AIX apparently does not).

Most systems have a program for system inventory which reports a variety of things, including memory.

Rather than go into great detail about each one, we’ll just put these out there for all of you to reference. Each environment has multiple commands that give available memory; each command is listed below.

Without further ado, here are a few answers to this burning question:

Solaris

  1. dmesg | grep mem
  2. prtdiag | grep Memory
  3. prtconf -v | grep Memory

AIX

  1. bootinfo -r
  2. lsattr -E1 sys0 -a realmem
  3. getconf REAL_MEMORY

HPUX

  1. dmesg | grep Physical
  2. /opt/ignite/bin/print_manifest | grep Memory
  3. machinfo | grep Memory

Linux

  1. dmesg | grep Memory
  2. grep -i memtotal /proc/meminfo
  3. free

OpenVMS

  1. show mem /page

Update:

FreeBSD

  1. dmesg | grep memory
  2. grep memory /var/run/dmesg.boot
  3. sysctl -a | grep mem
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