TLDR
Enter a command. For example: secd, shuf, whatis, launchctl, wacaw.

dd

 
Convert and copy a file. More information: https://ss64.com/osx/dd.html.
 
  • Make a bootable USB drive from an isohybrid file (such like archlinux-xxx.iso):
     
    dd if={{file.iso}} of=/dev/{{usb_drive}}
     
  • Clone a drive to another drive with 4 MB block and ignore error:
     
    dd if=/dev/{{source_drive}} of=/dev/{{dest_drive}} bs=4m conv=noerror
     
  • Generate a file of 100 random bytes by using kernel random driver:
     
    dd if=/dev/urandom of={{random_file}} bs=100 count=1
     
  • Benchmark the write performance of a disk:
     
    dd if=/dev/zero of={{file_1GB}} bs=1024 count=1000000

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