How to decompress file

1. tar -zxvf filename.tar.gz   **USE**--( {=tape archiver} Untar a tarred & compressed tarball {*.tar.gz or *.tgz,} that you downloaded from the Internet. 
2. tar -xvf filename.tar   **USE**--( Untar a tarred but uncompressed tarball {*.tar}.),
3. gunzip filename.gz   **USE**--( Decompress a zipped file {*.gz" or *.z}, Use gzip {also zip or compress}, if you wanted to compress files to this file format.), 
4. bunzip2 filename.bz2  **USE**--( {=big unzip} Decompress a file {*.bz2} zipped with bzip2 compression utility, Used for big files. ),
5. unzip filename.zip  **USE**--( Decompress a file {*.zip} zipped with a compression utility compatible with PKZIP for DOS.), 
6. unarj e filename.arj  **USE**--( Extract the content of an {*.arj} archive. ),
7. uudecode -o outputfile filename  **USE**--( Decode a file encoded with uuencode,  uu-encoded files are typically used for transfer of non-text files in e-mail {uuencode transforms any file into an ASCII file}).