dd

Convert and copy a file. More information: https://manned.org/man/dd.1p.

dd if=path/to/file.iso of=/dev/usb_drive

dd bs=4194304 conv=fsync if=/dev/source_drive of=/dev/dest_drive

dd bs=100 count=1 if=/dev/urandom of=path/to/random_file

dd bs=1024 count=1000000 if=/dev/zero of=path/to/file_1GB

dd if=/dev/drive_device of=path/to/file.img