Unix Admin - Day 3

Goals

• learn the unix filesystem and layout
• use find
• use tar
• learn how your server relates to its network
• learn the boot/reboot process

Review

POST

1. How can your get feedback on why a user is failing login?
2. How can you view your logs in real time?
3. How can you communicate with users, like in the case of an impending of an impending reboot? How is this useful?
4. Which files are given to new users? Where are they found?

the unix filesystem and layout

• everything is a file!
• everything stems from /
• every partition is mounted on a mountpoint
• see diagram on pg. 395
  • /
  • /var/log
  • /var/spool
  • /tmp
  • /usr/bin
  • /usr/sbin
  • /usr/local/bin

use find

• find /
• find . | grep
• find -atime +180
• find /somedir -mtime +7
• find -name pattern
• find . -name *.txt -print
• find . -name *.txt -exec cat {}\;

use tar

• tar cvf /path/to/tarball.tar /target make tarball
• tar xvf /path/to/tarball.tar untar!
• tar czvf /path/to/tarball.tar /target make inline zipped tarball
• tar xzvf /path/to/tarball.tar /target untar inline zipped tarball
• tar tzvf /path/to/tarball.tar view contents of inline zipped tarball

learn how your server relates to its network

• tcp/ip
• hostname
• localhost
• fakenets
• inetd v. daemons
• ping
• traceroute
• nslookup
• whois

Homework

• cron 383-391
• security 199-272
• captive shells 187
• adding drives 421-430, 442-448
• terminal hangs 542-543
• adding software 232-234