### Archive

Posts Tagged ‘unix’

## Smart backup for your GMail account

There are a number of solutions out there that allow you to back up your Google mail, but all of them have some significant shortcomings. That’s pretty surprising given the popularity of GMail. BaGoMa aims to address all (or most) of them.

1. BaGoMa is a command line application, so you can easily automate the backup. A GUI might be added in the future if there’s enough of a demand for it.
2. It runs on all major operating systems: Linux, Windows, Mac OS X, basically anything that Python runs on. For Windows users the zip file even contains a stand-alone executable that has the Python interpreter and libraries built-in, so you don’t need to install anything else.
3. It is open sourced, and contributions from the community are welcomed and encouraged. That also means you can read the source code  yourself to make sure your password and emails remain private.
4. It has no arbitrary limitations on the tag/label names you can use in Google. Some other solutions out there expect you to only use ASCII. That means non-English users are out of luck. It even auto-detects the main types of folders in use so that it can skip folders such as “Spam” and “Trash”.
5. Most importantly, it is tuned to work specifically with Google mail. There are a lot of generic applications that are able to backup an IMAP account. GMail however is not a true IMAP account. For example, if you apply 5 tags/labels to an email message, it shows up in 5 different IMAP folders. From the perspective of a regular IMAP application those look like 5 distinct messages, so they get backed up 5 times. It’s not clear what would happen when you attempt to restore your mail from such a backup. Will you end up with 5 identical copies of the message, each with a single tag/label, or will you end up with a single message that has 5 tags? BaGoMa does the right thing. In this case that means the message only gets downloaded (and backed up) once, and when restored all the original tags are applied to the same message.

The use of BaGoMa is extremely simple. To back up your account all you need is:

bagoma --email=your_user_id@gmail.com

To restore your email you would run:

bagoma --email=your_user_id@gmail.com --action=restore

So what are you waiting for? Give it a try and stop worrying about forgetting your password and getting locked out of your account, or losing important emails if Google ever has an E-Mail outage.

#### BaGoMa documentation: ﻿﻿﻿http://bagoma.sourceforge.net/

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## Uncompressing UNIX *.Z files

I searched online for a .NET library that can be used to decompress *.Z files (compressed by the UNIX compress utility) but was unable to find anything non-commercial. I found however some code in Java that looked promising, so I ported it to C#. I integrated the resulting code with the SharpZipLib library, but until that gets officially integrated and released, I decided to release a stand-alone version here.

The code is contained in a single file (download LzwInputStream.cs) and is pretty straight-forward to use. The following example shows how to uncompress a *.Z file using c-sharp.

using System;
using System.IO;

using Ebixio.LZW;

class MainClass
{
public static void Main(string[] args)
{
byte[] buffer = new byte[4096];
string outFile = Path.GetFileNameWithoutExtension(args[0]);

using (Stream inStream = new LzwInputStream(File.OpenRead(args[0])))
using (FileStream outStream = File.Create(outFile)) {