How much memory is in this UNIX/Linux machine?

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