Syntax

dd [ --if=name ] [ --of=name ] [ --bs=bytes ] [ --count=num ] 
   [ --ibs=bytes ] [ --obs=bytes ] [ --seek=num ] [ --skip=num ] 
   [ --imirror=num ] [ --omirror=num ] [ --mirror=num ] 
   [ --truncate ] [ --aio=naio ] [ --block ]
   [{ -w | --wallet } wallet-location ] [{ -T | --trace } trace-level ]

Command Options

The options for the dd command are:

• --if: Specifies the name of the input file to use instead of standard input.

• --of: Specifies the name of the output file to use instead of standard output.

• --bs: Specifies the number of bytes to read and write in each block. The default value is 512.

• --count: Specifies the number of input blocks.

• --ibs: Specifies the number of bytes to read at a time. The default value is 512.

• --obs: Specifies the number of bytes to write at a time. The default value is 512.

• --seek: Specifies the number of obs-sized blocks to skip at the start of the output.

• --skip: Specifies the number of ibs-sized blocks to skip at the start of the input.

• --imirror: Specifies the input mirror number. The first mirror is 0, the second mirror is 1, and so on. The default value is 255, which means 'read any mirror.'

• --omirror: Specifies the output mirror number. The first mirror is 0, the second mirror is 1, and so on. The default value is 255, which means 'write all mirrors.'

• --mirror: Specifies the input and output mirror number. The first mirror is 0, the second mirror is 1, and so on. The default value is 255, which means 'all mirrors.'

• --truncate Resizes the output file.

• --aio: Specifies the number of async I/Os to use. The default value is 4.

• --block: Specifies that the I/O offsets should be divisible by the relevant I/O block size.

• -w, --wallet: Optionally specifies the path to the Exascale wallet directory.

• -T, --trace: Optionally enables tracing and sets the trace level to 1 (minimum tracing), 2 (medium tracing), or 3 (maximum tracing).

  The trace file is written to the first accessible location in the following list:

  1. If the $ADR_BASE environment variable is set:

     $ADR_BASE/diag/EXC/xsh_<username>/<hostname>/trace/xsh_<date>.trc

  2. /var/log/oracle/diag/EXC/xsh_<username>/<hostname>/trace/xsh_<date>.trc

  3. /tmp/diag/EXC/xsh_<username>/<hostname>/trace/xsh_<date>.trc