Creating large empty files in Linux / UNIX - UNIX / Linux (*nix)

Tarrasque · 07-03-2008, 15:39

To create large empty files in Linux or UNIX:

# dd if=/dev/zero of=filename bs=1024 count=desired

Example to create a 1GB file:

dd if=/dev/zero of=file_1GB bs=1024 count=1000
/or/
dd if=/dev/zero of=file_1GB bs=4096 count=250
/or/
dd if=/dev/zero of=file_1GB bs=2048 count=500

Example to create a 2GB file:

dd if=/dev/zero of=file_2GB bs=2048 count=1000
/or/
dd if=/dev/zero of=file_2GB bs=1024 count=2000

Example to create a 512MB file:

dd if=/dev/zero of=file_512MB bs=1024 count=500
/or/
dd if=/dev/zero of=file_1GB bs=512 count=1000

either use

# mkfile size myfile

where can be in KB, MB or GB using k, m or g as suffix. To create a 10 GB file, use

# mkfile 10240m myfile

If you run # mkfile -n 10240m myfile the file will be created, but the disk blocks will not get allocated, only when writing data into the file.

07-03-2008, 15:39	#1
Tarrasque 初心者註冊日期: Dec 2007 文章: 2909 積分: 84774	Creating large empty files in Linux / UNIX To create large empty files in Linux or UNIX: # dd if=/dev/zero of=filename bs=1024 count=desired Example to create a 1GB file: dd if=/dev/zero of=file_1GB bs=1024 count=1000 /or/ dd if=/dev/zero of=file_1GB bs=4096 count=250 /or/ dd if=/dev/zero of=file_1GB bs=2048 count=500 Example to create a 2GB file: dd if=/dev/zero of=file_2GB bs=2048 count=1000 /or/ dd if=/dev/zero of=file_2GB bs=1024 count=2000 Example to create a 512MB file: dd if=/dev/zero of=file_512MB bs=1024 count=500 /or/ dd if=/dev/zero of=file_1GB bs=512 count=1000 either use # mkfile size myfile where can be in KB, MB or GB using k, m or g as suffix. To create a 10 GB file, use # mkfile 10240m myfile If you run # mkfile -n 10240m myfile the file will be created, but the disk blocks will not get allocated, only when writing data into the file.

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