VG wrote:
> Hello All,
>
> I like to know how can I achieve the same functionality that is give by desc
> commnad in mysql or oracle.

http://www.postgresql.org/docs/8.3/static/app-psql.html

See the \d command, e.g. "\d mytable"

There are many different backslash commands that can give you details on
tables, views, functions, schemas etc.

> Also specify me the book related to pgsql as a beginner.

http://www.postgresql.org/docs/8.3/static/index.html
http://www.postgresql.org/docs/books/

> Presently my task is going to be communication of ruby with pgsql

Start here I suppose:
http://rubyforge.org/projects/ruby-pg/

--
Richard Huxton
Archonet Ltd

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