Problem With gunzip backup

["Ashish Karalkar" <ashish.karalkar@xxxxxxxxxxxxxxxxx>]

Hello All,

I am having following PostgreSQL & Linux version

 

 PostgreSQL 8.2.0 on i686-pc-linux-gnu, compiled by GCC gcc (GCC) 3.4.3 20041212 (Red Hat 3.4.3-9.EL4)

 

I am trying to create the backupfile using gunzip utility

 

pg_dump qsweb | gzip > /usr/local/backup/backup.gz

But when I run this command i get error

 stdin: not in gzip format

tried with 

pg_dump qsweb | gzip > /usr/local/backup/backup.tar.gz
but same problem again

Can any body please suggest what is going wrong

Thanks In advance

With Regards

Ashish...