Ubuntu / Debian - print used architecture by apt and dpkg (x86, x64, armhf, arm64, etc.)

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# ----------------------------------------------------------------------------
# Native architecture
# ----------------------------------------------------------------------------

dpkg --print-architecture


# Example output 1 (AMD Ryzen 5900x):
#
#     x86_64


# Example output 2 (Raspberry PI 5):
#
#     aarch64



# ----------------------------------------------------------------------------
# Foreign architectures (the architectures that have been added to the system)
# ----------------------------------------------------------------------------

dpkg --print-foreign-architectures


# Example output 1 (AMD Ryzen 5900x):
#
#     i386


# Example output 2 (Raspberry PI 5):
#
#     arm64