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When I run uname -a, I get:

Linux 2.6.18-164.el5 #1 SMP Tue Aug 18 15:51:48 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux

and I understand that x86_64 is supposed to imply 64-bit kernel, but why does this number appear 3 times? What does each instance signify?

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3 Answers 3

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4

Uname has separate commands to print "machine, processor and hardware platform" -- all of these are all the same in your case. The following outputs, respectively, may make it clear:

~$ uname -m # print machine x86_64 ~$ uname -p # print processor x86_64 ~$ uname -i # print hw platform x86_64
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3

use uname -m command to display only name of the kernel.

in your case

uname -m

x86_64

means 64-bit

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2

uname -a

will give you all details about your system. It includes machine hardware name, processor type & hardware platform too.

So,

  1. x86_64 is machine name.
  2. x86_64 is processor type.
  3. x86_64 is hardware platform.

Use:

uname --help

to get more idea about its options.

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