bz2

Create an archive(bundle together a bunch of files or directories into a single file)
```
bzip2 filename.txt
```
Extract files from an archive(recover all the files or directories from the tar file)
```
tar -xjf file.bz2
bunzip2 filename.txt.bz2
```
If the fine ends in .xz (The -J is the flag that specifically deals with .xz files.)
```
tar -xJf file.pkg.tar.xz
```

Using BZ2