tldr/pages/osx/dd.md

dd

Convert and copy a file. More information: https://keith.github.io/xcode-man-pages/dd.1.html.

• Make a bootable USB drive from an isohybrid file (such like archlinux-xxx.iso) and show the progress:

dd if={{path/to/file.iso}} of={{/dev/usb_drive}} status=progress

• Clone a drive to another drive with 4 MB block, ignore error and show the progress:

dd bs=4m conv=noerror if={{/dev/source_drive}} of={{/dev/dest_drive}} status=progress

• Generate a file with a specific number of random bytes by using kernel random driver:

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

• Benchmark the write performance of a disk:

dd bs={{1024}} count={{1000000}} if=/dev/zero of={{path/to/1GB_file}}

• Create a system backup, save it into an IMG file (can be restored later by swapping if and of), and show the progress:

dd if={{/dev/drive_device}} of={{path/to/file.img}} status=progress

• Check the progress of an ongoing dd operation (run this command from another shell):

kill -USR1 $(pgrep ^dd)