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Full Discussion: Script to fill the file system mount with empty files to desired size
Homework and Emergencies Emergency UNIX and Linux Support Script to fill the file system mount with empty files to desired size Post 302731235 by ctsgnb on Wednesday 14th of November 2012 02:21:58 PM
Old 11-14-2012
Code:
threshold=80
FStoFill=/tmp
set -- $(df -k $FStoFill | tail -1)
dd if=/dev/zero of=$FStoFill/zerofile.$$ bs=1k count=$((($threshold*$2/100)-$3))

But the dd command above may be set up to be faster (search for the msg posted by Alister )

The idea was to use /dev/null instead, as well as seek to avoid a bunch of useless zero writting so something like :

Code:
dd if=/dev/null of=dummy seek=37580963840 bs=1

Just tweak it in a way you can replace the dd if=/dev/zero... of the first code with the more optimized dd if=/dev/null ... command
Last edited by ctsgnb; 11-14-2012 at 03:27 PM..
This User Gave Thanks to ctsgnb For This Post:
chandu123
 

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LEARN ABOUT LINUX

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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