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How can you trim files using the command line?

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http://unix.stackexchange.com – What is the console equivalent of the following Python code: target = file("disk", "w") # create a file target.seek(2*1024*1024*1024) # skip to 2 GB target.write("\0") target.close() Maybe some dd incantation? The idea is making a file with the apparent size of 2 GB for use e.g. in virtualization. kvm disk -cd whatever.iso #Only allocate space as necessary (HowTos)

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Submitted by Songlist on 12/20/2012

Stories similar to How can you trim files using the command line?

I want to run followed command:

tshark -l > some.txt

As you see I write stdout to some.txt file.

But I get under /tmp folder temp files named etherXXXX* and these files can increase to 1-2G during 1 hour.

From tshark man I found to use -b option.

So I wrote:

tshark -b filesize:1024 -b files:5 -l > some.txt

and got error: tshark: Maximum capture file size specified, but capture

ssh-keygen issue on AIX 1 year 14 weeks ago

Hi ,

I am trying to create public key on my AIX server on other than home directory.However the command does not ask for Enter file in which to save the key : It is directly taking me to Enter the passphrase. I don't want to save the key in home dir as that is the home dir for other userID too. Please help. Here is the screenshot :

Code:

$ ssh-keygen -t dsa -b 1024 Generating 1024-bit ds

I have a config file in augeas using a custom lens that outputs the data as follows.

Although some file archivers offer us the option of split the files, this can be easily accomplished with two commands: split and cat. Splitting a file with split

split just needs the size of the parts that we want to create, and the file that we want to split, e.g.:

split -b 1024 file_to_split.bin

Hi All,

i have a requirement where i need to format the input RAW file ( which is CSV) by using another mapping file(also CSV file).

I always wondered why rsync tries to transfer a file to a remote location where it has read/execute permissions for the target dir, but no write permissions to create the actual destination file.

Given the size of a file in bytes, I want to format it in kibibytes, mebibytes etc. to 3 significant figures with trailing zeros, e.g. 1883954 becomes 1.80M. Floating-point arithmetic isn't supported in bash, so I used awk instead. The problem is I don't how to keep the trailing zeros.

I am trying to hot-add a file-based disk to a running KVM virtual server.

Du -sk command in SunOS 5.10 35 weeks 1 day ago

Hi,

I am little confuse after using

Code: du -sk on file . I have file listing like:

Code: -rw-r--r-- 1 Xuser Ygrp 51419029531 Sep 21 07:40 catalina.out when i issue cmd : Code: du -sk catalina.out gives output as

Code: 1804511 catalina.out This means 1804511 KB. Which means 1 GB.