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The advantages of this approach are as follows:
- it is blazingly fast taking around 1 second to generate a 1Gb file (dd if=/dev/zero of=file.txt count=1024 bs=1048576 where 1048576 bytes = 1Mb)
- it will create a file of exactly the size that you specified.
How To Quickly Generate A Large File On The Command Line (With ...
https://www.skorks.com/.../how-to-quickly-generate-a-large-file-on-the-command-line-...
Linux / UNIX: Create Large 1GB Binary Image File With dd Command ...
https://www.cyberciti.biz/faq/howto-create-lage-files-with-dd-command/
Jun 2, 2008 - Creating an image file with dd command. First, make sure you've sufficient disk space to create a image file using dd: $ df -H. To create 1MB file (1024kb), enter: $ dd if=/dev/zero of=test.img bs=1024 count=0 seek=1024. You will get an empty files (also known as "sparse file") of arbitrary size using above ...command line - Create a test file with lots of zero bytes - Unix ...
https://unix.stackexchange.com/questions/.../create-a-test-file-with-lots-of-zero-bytes
Nov 26, 2013 - With GNU truncate : truncate -s 1M nullbytes. (assuming nullbytes didn't exist beforehand) would create a 1 mebibyte sparse file. That is a file that appears filled with zeros but that doesn't take any space on disk. Without truncate , you can use dd instead: dd bs=1048576 seek=1 of=nullbytes count=0.dd - Creating a large size file in less time - Ask Ubuntu
https://askubuntu.com/questions/506910/creating-a-large-size-file-in-less-time
Aug 4, 2014 - How about using fallocate, this tool allows us to preallocate space for a file (if the filesystem supports this feature). For example, allocating 5GB of data to a file called 'example', one can do: fallocate -l 5G example. This is much faster than dd, and will allocate the space very rapidly.How To Quickly Generate A Large File On The Command Line (With ...
https://www.skorks.com/.../how-to-quickly-generate-a-large-file-on-the-command-lin...
Mar 21, 2010 - The advantages of this approach are as follows: it is blazingly fast taking around 1 second to generate a 1Gb file (dd if=/dev/zero of=file.txt count=1024 bs=1048576 where 1048576 bytes = 1Mb) it will create a file of exactly the size that you specified.dd - How do I create a 1GB random file in Linux? - Super User
https://superuser.com/questions/470949/how-do-i-create-a-1gb-random-file-in-linux
Sep 6, 2012 - up vote 0 down vote. Try this script. #!/bin/bash openssl rand -base64 1000 | dd of=sample.txt bs=1G count=1. This script might work as long as you don't mind using /dev/random . #!/bin/bash dd if=/dev/random of="sample.txt bs=1G count=1"Create file of 2 GB - LinuxQuestions
https://www.linuxquestions.org/questions/linux-newbie.../create-file-of-2-gb-666797/
Sep 1, 2008 - 9 posts - ‎4 authors
Old 09-01-2008, 04:00 AM. mohans.grd@gmail.com. LQ Newbie. Registered: Sep 2008. Posts: 3. Rep: Reputation: 0. Easy way to create 2gb file. Go to that current directoy #dd if=/dev/zero of=filename bs=1024 count=2GB ...creating file of 1MB using shell command? | Unix Linux Forums ...
https://www.unix.com › Top Forums › Shell Programming and Scripting
Mar 29, 2006 - 5 posts - ‎3 authors
when generating files of huge size, it is better you attack from the block size thereby reducing the count for a 1 MB file,. Code: dd if=/dev/zero of=output.file bscommand line - How to create a file with a given size in Linux ...
https://stackoverflow.com/questions/.../how-to-create-a-file-with-a-given-size-in-linux
Sep 26, 2008 - Just to follow up Tom's post, you can use dd to create sparse files as well: dd if=/microHOWTO: Create a file filled with zeros
www.microhowto.info/howto/create_a_file_filled_with_zeros.html
Jump to Using dd - A more portable solution is to use the dd command. This can be used to create a non-sparse file: dd if=/dev/zero of=vdrive.img bs=1024 count=4194304. or an (SDB:Create 10 GB file instantly with "dd" - openSUSE
https://en.opensuse.org/SDB:Create_10_GB_file_instantly_with_%22dd%22
Filesystem 1K-blocks Used Available Use% Mounted on /dev/hda2 40321836 28054876 12266960 70% / tmpfs 257892 0 257892 0% /dev/shm. This means that you have some 12 GB of unused space, so you can proceed with next command that will create 10 GB file: dd if=/dev/zero of=myharddisk.img bs=1000 count=0 ...