Unix system administration: 'hardening the OS'

hi,
I want to learn the basic UNIX(and LINUX) commands in system administration. I want to know what are the important files to be monitored and the best ways of maintaining a secure stable system.
can u suggest some books / websites / your valuable advice???
thanx
java_loverAsked:
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expert141Commented:
I believe the following book would definitely help you:

Title:

Essential System Administration

Author:

Aeleen Frisch

Publication:

O’Reilly Associate, Inc.


Good Luck.

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tfewsterCommented:
Check out www.ugu.com as well - FAQs, sysadmin tips & links to details on most flavours of Unix.

IMHO, the MOST useful command for a sysadmin is "df", to monitor fileystem usage; Then "du" to see what's filling up those filesystems.../var tends to be the worst offender.

No doubt others will argue that backups, user support and monitoring error logs are more important, but I like to try to look ahead & spot trends before they become a problem!



Have fun :)
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tfewsterCommented:
java_lover, how are you getting on with your reading?
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