Books for person who want to be Linux/Unix administrator

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http://www.unix.com – Hi, I would like to become Linux/Unix administrator. Of course I am aware that it is practically impossible to get that job immediately and in the beginning it will be Junior position or 2nd level of technical support. But I would like to ask: how in-depth knowledge about daemons such like Apache, Sendmail, BIND, Samba should I have? Do you think that a description which is included in book "Unix Administration Handbook" is enough to apply for entry-level position? I enjoy with tools such like vi, bash, awk etc. and I can learn it easily. But I am not sure about how I should interpr (HowTos)