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I know this question has been asked a number of times, but my system seems to contradict itself…

Following the answer to this question, I have run the following:

$ uname -a
Linux manaha 3.13.7-x86_64-linode38 #1 SMP Tue Mar 25 12:59:48 EDT 2014 x86_64 x86_64 x86_64 GNU/Linux
$ file /sbin/init
/sbin/init: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.24, BuildID[sha1]=0xc0d86a25a7abb14cad4a65a1f7d03605bcbd41f6, stripped

So, while uname seems to suggest 64-bit, /sbin/init suggests 32-bit. What's happening here?

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That is strange! Did you ever re-compile the kernel yourself? –  i08in Apr 20 at 15:37
    
dpkg --print-architecture will give your original architecture. –  Avinash Raj Apr 20 at 15:54
    
$ dpkg --print-architecture yields i386. I haven't recompiled the kernel -this box is hosted by Linode and recently I swapped to be kernel in their web management backend to enable some free upgrades they were offering. –  forquare Apr 21 at 8:05

2 Answers 2

up vote 2 down vote accepted

In computing, the Executable and Linkable Format (ELF) is a common standard file format for executables, object code, shared libraries, and core dumps. In your question /sbin/init: ELF 32-bit LSB shared object identifies ELF as the format for a 32-bit shared object from a shared library. Your operating system is a 64-bit OS that has a 32-bit shared object somewhere in it. There is no contradiction in this.

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That would mean file /sbin/init is not a reliable method to know whether you are running a 32-bit or a 64-bit OS, right? –  i08in Apr 20 at 16:11
    
@Jobin uname -a is a simpler and less potentially confusing way to know whether you are running a 32-bit or a 64-bit OS than file /sbin/init. –  karel Apr 20 at 18:23
    
So, if init is 32-bit, and init starts all processes (sorry, been a few years since I've done this low-level stuff), does this mean that I can only run 32-bit apps, but the kernel is running in 64-bit mode? –  forquare Apr 21 at 8:03
    
Take a look at this answer that I posted today. It will also help to read the question and visit the link in the answer. In a nutshell, Ubuntu 14.04 64-bit (64-bit Linux kernel) can also run 32-bit apps by running the command: sudo dpkg --add-architecture i386. –  karel Apr 21 at 8:12

While the uname command tells you something about your system, the file command tells you something about a file. So the file command says "init" is a 32-bit file and the uname command says you have a 64-bit computer. I hope this helps.
Please point out any mistakes I made as fast as possible, just in case it causes any harm.
PS did you read the other answers to the post you're linking to? This answer seems a really easy way to find out your architecture: http://askubuntu.com/a/65731/271517

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