DD(1) DD(1) (NAME) dd - (SYNOPSIS) dd []... dd (DESCRIPTION) . bs= (: ) ibs obs cbs= conv= count=N N ibs= (: ) if= (stdin) iflag= obs= (: ) of= (stdout) oflag= seek=N ( oseek=N) N obs skip=N ( iseek=N) N ibs status= (stderr) 'none' 'noxfer' 'progress' N : 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. : KiB=K, MiB=M, . N 'B' . CONV : ascii EBCDIC ASCII ebcdic ASCII EBCDIC ibm ASCII EBCDIC block (space) cbs unblock cbs lcase ucase sparse (seek) NUL swab sync NUL ibs block unblock NUL excl nocreat notrunc (truncate) noerror fdatasync fsync fdatasync FLAG : append ( conv=notrunc ) direct I/O directory dsync I/O sync dsync fullblock ( iflag) nonblock I/O noatime nocache (cache). oflag=sync noctty nofollow USR1 dd I/O . : --help --version (AUTHORS) Paul Rubin David MacKenzie Stuart Kemp. (REPORTING BUGS) GNU coreutils: : (COPYRIGHT) (C) 2022 Free Software Foundation, Inc. GPLv3+: GPL . : . . (SEE ALSO) : : info '(coreutils) dd invocation' GNU coreutils 9.1 2022-09-01 DD(1)