1. *** inode ***
(related) zombie, link
2. regular expression - to match "word_word"
special symbols
3. how many hosts are in IP/17
4. buffer overflow
(hint) chroot
5. shell script - to wait bg process (waitpid?)
to get pid of current shell
to findout what occupys resources
to be spider problems around the world
6. perl or python
7. apache - virtual host
httpd.conf
8. stat(?)
9. hub v.s. switch
10. performace of harddisk
11. throughput of network - ping, tcpdump, ifconfig
12. ssh -> remote control, automation
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