setarch

Run a command as if the machine architecture is i686

$ setarch i686 [command]

$ setarch x86_64 [bash]

$ setarch [linux32] -R [command]

$ setarch --list

setarch [arch] [options] [program [arguments]]

setarch changes the reported architecture for a program's execution environment. It modifies what uname -m reports and can affect how programs behave based on architecture detection.
The command is useful for running 32-bit applications on 64-bit systems, compatibility testing, and debugging programs that behave differently based on architecture. The linux32 and linux64 symlinks are shortcuts for common uses.

arch

Target architecture (i686, x86_64, linux32, linux64, etc.)

Disable address space layout randomization (ASLR)

Use legacy 32-bit inode values

Set uname to report 2.6 kernel

Limit address space to 32 bits

List supported architectures

Verbose output

Does not enable actual architecture emulation; the underlying CPU must support the requested mode. Disabling ASLR (-R) reduces security and should only be used for debugging. Part of the util-linux package.

linux32(8), linux64(8), uname(1), personality(2)