Command similar to "touch" for modify File size

UNIX for Advanced & Expert Users
1

Hi All,
I'm trying to find a command like similar to "touch" which would let me change the file size property.
For ex: I have a file of size 1MB using the command i would like to set/update the size something like 1KB.
Is it possible? Is there any such command which would accomplish this task for me? Kindly suggest.

Regards,
Harsha

2

if you are not concerned about the contents of file, overwrite the file (of 1 MB in your case) with a different file having the required size (1KB in your case)

3

Exactly, Yogesh.

To expand a bit on this: if you want to keep the inode number, but don't care about the content use dd:

dd if=/dev/zero of=/your/file bs=<nr of bytes the file should have> count=1

bakunin

4

this helps to change the size of a file to 1 KB:

dd if=/dev/zero of=hollow_and_empty bs=1024 count=1

dd --help for more info