Check If Linux Is 32-bit or 64-bit

Why it matters

• Programs are built for one architecture. A 64-bit system can run most 32-bit programs only with extra libraries.
• 64-bit systems can use much more RAM.
• Drivers must match your architecture.

Method 1: uname

uname -m

Method 2: arch

arch

It prints the same value: x86_64 for 64-bit and i686 for 32-bit.

Method 3: lscpu

lscpu

Look at the line CPU op-mode(s).

• 32-bit, 64-bit means a 64-bit CPU that can run both modes.
• 32-bit means a 32-bit CPU.

The line Architecture shows the architecture of the running system.

Method 4: Desktop settings

Open Settings, then About. Look for OS type or Architecture.

Method 5: Package tools

On Debian and Ubuntu:

dpkg --print-architecture

A result of amd64 is 64-bit. You can also run getconf LONG_BIT. It prints 32 or 64.

Quick recap

• uname -m is the fastest check.
• x86_64 or amd64 means 64-bit. i686 means 32-bit.