dd command
Posted on :: Updated on :: storage

Source:

  • if 'if=' not present it reads from stdin

  • if 'of=' not present it writes to stdout

  • bs = block size, default 512 bytes, change to 1 byte if you want to write single byte

  • count = no. of block size bytes to write for eg if bs=1, count=4 will write 4 bytes

  • seek = write at seek position to block size * number

  • skip = skip block size * number while reading

$ printf '🐱' | dd of=/dev/xvd1 
$ dd if=/dev/xvd1 count=1 2> /dev/null | hexdump -C

$ printf "$(dd if=/dev/xvd1 bs=1 count=4 2> /dev/null)\n"

$ printf '🐱' | dd of=/dev/xvd1 bs=1 seek=4

$ printf "$(dd if=/dev/xvd1 bs=1 count=8 2> /dev/null)\n"

Questions