Linux shell scripting

hi guys,
which book u all prefer to learn linux shell scripting from the scratch for a oracle dba.
need suggestion from uall.
thanks in advance

Find a book that looks interesting, and has good examples. And then write scripts using those examples. Of course you need to know which shell you are working with. I use bash when possible. There is also zsh and ksh. But for Linux you might want to stick to bash.