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    <p>Try <a href="http://linuxmanpages.net/manpages/fedora16/man1/uname.1.html" rel="noreferrer"><code>uname -m</code></a>. Which is short of <code>uname --machine</code> and it outputs: </p> <pre><code>x86_64 ==&gt; 64-bit kernel i686 ==&gt; 32-bit kernel </code></pre> <hr> <p>Otherwise, <strong>not for the Linux kernel, but for the CPU</strong>, you type:</p> <pre><code>cat /proc/cpuinfo </code></pre> <p>or:</p> <pre><code>grep flags /proc/cpuinfo </code></pre> <p>Under "flags" parameter, you will see various values: see "<a href="https://unix.stackexchange.com/a/43540">What do the flags in /proc/cpuinfo mean?</a>" Among them, one is named <code>lm</code>: <code>Long Mode</code> (<a href="http://en.wikipedia.org/wiki/X86-64" rel="noreferrer">x86-64</a>: amd64, also known as Intel 64, i.e. 64-bit capable)</p> <pre><code>lm ==&gt; 64-bit processor </code></pre> <p>Or <a href="http://linux.die.net/man/1/lshw" rel="noreferrer">using <code>lshw</code></a> (as mentioned <a href="https://stackoverflow.com/a/32717681/6309">below</a> by <a href="https://stackoverflow.com/users/4637585/rolf-of-saxony">Rolf of Saxony</a>), without <code>sudo</code> (just for grepping the cpu width):</p> <pre><code>lshw -class cpu|grep "^ width"|uniq|awk '{print $2}' </code></pre> <p><strong>Note: you can have a 64-bit CPU with a 32-bit kernel installed</strong>.<br> (as <a href="https://stackoverflow.com/users/637866/ysdx">ysdx</a> mentions in <a href="https://stackoverflow.com/a/32665383/6309">his/her own answer</a>, "Nowadays, a system can be <strong><a href="https://wiki.debian.org/Multiarch" rel="noreferrer">multiarch</a></strong> so it does not make sense anyway. You might want to find the default target of the compiler")</p>
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    1. POHow to determine whether a given Linux is 32 bit or 64 bit?
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    1. POHow to determine whether a given Linux is 32 bit or 64 bit?
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    1. COgrep flags /proc/cpuinfo only tells you wether the CPU is 64bit. As I understand the question it was about the OS. uname -m only tells me "i686".
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    2. COI run a 32bit kernel.
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    3. CO@Kim: true. I have update my answer to adequately reflect the difference between the kernel and the CPU
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