Extract Tar the Tar.Bz2 File Error

Uncompress an tar.bz2 file with Python tarfile module

You use tar.extractall with wrong argument. I think, you need something like this

import tarfile
tar = tarfile.open("path_to/test/sample.tar.bz2", "r:bz2")  
tar.extractall()
tar.close()

or

import tarfile
tar = tarfile.open("path_to/test/sample.tar.bz2", "r:bz2")  
for i in tar:
  tar.extractfile(i)
tar.close()

If you need to extract files to some specific folder

import tarfile
tar = tarfile.open("path_to/test/sample.tar.bz2", "r:bz2")  
tar.extractall(some_path)
tar.close()

How to untar a file

The message is saying that, in your current directory (which I assume is your home directory, when you start your bash shell in default manner), there is no file such as lammps-stable.tar.gz.
To solve this, I will break the problem in two steps.

(1) First find where is the "lammps-stable.tar.gz"

(2) Use the full path (obtained in step 1) and give it to tar command

How to get these.
Folder structure in Ubuntu starts from "/" (also called root). All other folders are nested within it. Every user has a folder in "/home". Say the username is "singh", all the folders and files by default will be stored in "/home/singh" or somewhere nested within it. You can know your user name by typing "whoami" in the bash shell or to locate your current directory, you can type "pwd".

(1) If you have a fair idea where the "lammps-stable.tar.gz" might be then the search will be shortened otherwise it will take a long time to finish (alongwith many warnings of 'Permission Denied').

(1-a) You have rough idea that the "lammps-stable.tar.gz" is in /home/singh/Documents, then you will say the following

   find "/home/singh/Document" -name "lammps-stable.tar.gz"

See the output of above command and let us call it step 1 result.

(1-b) You don't have much idea, where it is but you are sure the file belongs to you (user = singh), then I would say the following. This might take long time.

   find "/home/singh/" -name "lammps-stable.tar.gz"

See the output of above command and let us call it step 1 result

(1-c) You don't any idea, where it is but you are sure the file is somewhere on the computer, then I would say the following. This might take long time.

   find "/" -name "lammps-stable.tar.gz"

See the output of above command and let us call it step 1 result

(2) Now using the result of Step1, just copy the path (let's say it is /MyFullPathToTheTarGZfile), then do the following.

tar xvzf /MyFullPathToTheTarGZfile 

All the best.

Extracting a .tar file returns, “This does not look like a tar archive.”

It's not a tar file. The download fails and the ".tar" file you get is really a html fail saying:

"

403 Forbidden

Forbidden

You don't have permission to access /public/snake_toxins/SNAKE_ALL.tar
on this server.

---

Apache/2.2.15 (Linux/SUSE) mod_ssl/2.2.15 OpenSSL/1.0.0 PHP/5.3.3 Server at www.cbs.dtu.dk Port 80
"

Next time you get something like this run the commman:

file SNAKE_ALL.tar to see what kind of file it really is.

Reading individual bz2 files from a tar file

BZ2File expects a file name as first argument and you pass a file object (i.e. an object which has the same API as what Python returns for open()).

To do what you want, you'll have to read all the bytes from t_extract yourself and call bz2.decompress(data) or use BZ2Decompressor to stream the data through it.

Extracting .tar file isn't working

try the following command:

tar -xzvf filename.tar.gz

Untar file with subprocess.call is running successfully but with no effect

If you read the man page, you'll see that the -C parameter is sensitive to order -- it only affects operations that come after it on the command line. So, your file is being unzipped into whatever random directory you happen to be in.

You don't need shell for this. Do:

import os
import subprocess

os.chdir('/folder')
subprocess.call( ['tar','xvfz', 'file.tar.gz'] )

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