DD(1) General Commands Manual DD(1) (NAME) uu-dd - (SYNOPSIS) dd [OPERAND]... dd OPTION (DESCRIPTION) . (OPTIONS) -h, --help -V, --version [operands] (EXTRA) (Operands): - bs=BYTES : BYTES (: 512) ibs obs . - cbs=BYTES : << >> . conv=block conv=unblock . - conv=CONVS : ( ) . - count=N : N ibs (EOF). N iflag=count_bytes . - ibs=N : (: 512). - if=FILE : . stdin . - iflag=FLAGS : . FLAGS . - skip=N ( iseek=N) : N ibs /. N iflag=seek_bytes . - obs=N : (: 512). - of=FILE : . stdout . - oflag=FLAGS : . FLAGS . - seek=N ( oseek=N) : N obs /. N oflag=seek_bytes . - status=LEVEL : stderr . dd . : 6+0 records in 16+0 records out 8192 bytes (8.2 kB, 8.0 KiB) copied, 0.00057009 s, 14.4 MB/s <<>> <<>> . ibs obs . + . ( conv=block ) . LEVEL : - progress : . - noxfer : . - none : . INFO ( ) USR1 . POSIXLY_CORRECT ( ) USR1 . (Conversion options): - ascii : EBCDIC ASCII. ebcdic . conv=unblock . - ebcdic : ASCII EBCDIC. ascii . conv=block . - ibm : ASCII EBCDIC [ ] ~ POSIX. conv=block . - ucase : . - lcase : . - block : cbs=BYTES cbs . cbs (truncate) . - unblock : cbs=BYTES . - sparse : obs . - swab : . . - sync : ibs . block unblock . - excl : . - nocreat : . - notrunc : (truncate) . - noerror : dd Error::Interrupted . - fdatasync : . - fsync : . (Input flags): - count_bytes : count=N . - skip_bytes : skip=N . - fullblock : ibs . (EOF) . (Output flags): - append : (append mode). conv=notrunc . - seek_bytes : seek=N . (General flags): - direct : / (direct I/O) . - directory : ( iflag) ( oflag) . - dsync : / (synchronized I/O) . - sync : / . - nonblock : / (non-blocking I/O). - noatime : . - nocache : (cache). - noctty : tty . - nofollow : . (VERSION) v(uutils coreutils) 0.11.0 2026-09-01 DD(1)