DD(1) DD(1) dd - dd []... dd . bs= (: 512) ibs obs cbs= conv= count= ibs= (: 512) if= iflag= obs= (: 512) of= oflag= seek= ( oseek=) obs skip= ( iseek=) ibs status= 'none' 'noxfer' 'progress' : c=1 w=2 b=512 kB=1000 K=1024 MB=1000*1000 M=1024*1024 xM=M GB=1000*1000*1000 G=1024*1024*1024 T P E Z Y R Q. : KiB=K MiB=M . 'B' . : ascii EBCDIC ASCII ebcdic ASCII EBCDIC ibm ASCII EBCDIC cbs unblock cbs lcase ucase sparse (NUL) swab sync (NUL) ibs block unblock excl nocreat notrunc noerror fdatasync fsync : append ( conv=notrunc) direct / directory dsync / sync fullblock ( iflag ) nonblock / noatime nocache . oflag=sync noctty nofollow USR1 'dd' / . : --help --version . : bug-coreutils@gnu.org GNU coreutils : : (C) 2026 (Free Software Foundation, Inc.). GPLv3+: GNU GPL 3 . . : . . : info '(coreutils) dd invocation' 3 . . : . GNU coreutils 9.11 2026 DD(1)