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Full Discussion: dd - binary file
Top Forums Shell Programming and Scripting dd - binary file Post 302264911 by otheus on Friday 5th of December 2008 06:12:47 AM
Old 12-05-2008
Quote:
Originally Posted by spiriad
I have a task that says: make a file (called binaryfile ) that contains
4 bytes of NULL data
...
For the first 2, I can used :
dd if=/dev/null of=binaryfile bs=8 count =4 and
No, you need to use /dev/zero. This will not output anything no matter how many bytes you ask it to. For the subsequent tasks, you output dd to a filter which will convert the 0's to whatever:
Code:
dd if=/dev/zero bs=1 count=8 | tr '\0' '\1'

 

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LEARN ABOUT MOJAVE

mkdevmaps

mkdevmaps(1M)                                             System Administration Commands                                             mkdevmaps(1M)

NAME

       mkdevmaps - make device_maps entries

SYNOPSIS

       /usr/sbin/mkdevmaps

DESCRIPTION

       The  mkdevmaps  command  writes  to standard out a set of device_maps(4) entries describing the system's frame buffer, audio, and removable
       media devices.

       The mkdevmaps command is used by the init.d(4) scripts to create or update the /etc/security/device_maps file.

       Entries are generated based on the device special files found in /dev. For the different  categories  of  devices,  the  mkdevmaps  command
       checks for the following files under /dev:

       audio           /dev/audio, /dev/audioctl, /dev/sound/...
       tape            /dev/rst*, /dev/nrst*, /dev/rmt/...
       floppy          /dev/diskette, /dev/fd*, /dev/rdiskette, /dev/rfd*
       removable disk  /dev/dsk/c0t?d0s?, /dev/rdsk/c0t?d0s?
       frame buffer    /dev/fb

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWcsu                      |
       +-----------------------------+-----------------------------+
       |Interface Stability          |Obsolete                     |
       +-----------------------------+-----------------------------+

SEE ALSO

       allocate(1), bsmconv(1M), attributes(5)

NOTES

       mkdevmaps might not be supported in a future release of the Solaris operating system.

SunOS 5.10                                                          8 Oct 2003                                                       mkdevmaps(1M)
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