Introduction
You may have created compressed backups using bzip2 and need to uncompress them.
The command to uncompress a .bz2 extension file is bunzip.
Procedure
Let's say in /home you have a file named mydb-sql.bz2 and you need to uncompress the file because it's a sql dump you want to restore.
the command to uncompress that file is
bunzip /home/mydb-sql.bz2