Clone USB stick or sd card

[Mike R]

The command is

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sudo dd if=/path/of/stick of-=/path/to/place/file.iso

This creates an burnable iso file which is an exact copy - same size as usb stick or device - for use later if needed.
Other useful commands are

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lsblk

giving you mount points of the drives
and

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$ dmesg | grep -i usb
$ dmesg | grep -i 'attached'

to list attached devices