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4. Network

1. Hardware, cables, Crimping, swicthes, routers (active and passive components)

2. ifconfig, ping, traceroute, ip, netstat, nslookup, dig, whois, telnet, iptraf, ethereal, nmap,

xnmap, lynx, elinks5. Internet

1. adsl or PPPoE

3. Others1. System administration

1. User management

1. useradd, passwd, finger, userdel, usermod, groupadd, groupdel, groupmod2. /etc/skel director, /etc/profile, /etc/profile.d

3. su, sudo

2. disk management

1. fdisk, parted, mkfs, fsck2. quota, quotacheck, quotaoff, quotaon, quotastats

3. df, du

3. file management1. file permissions

1. chmod, chattr

2. file ownerships1. chown, chgrp

4. backup and restore

1. tar, gzip, bzip, gunzip, bunzip, cpio, dd5. process management

1. ps, pgrep, kill, xkill, killall, top, nice, renice, sar

6. Services management

1. chkconfig, /etc/xinetd.d (folder), service start|stop|restart|status|reload

2. /var/run (folder), /var/lock/subsys

7. Network management1. telnet, ifconfig, ping, traceroute, ip, netstat, nslookup, dig, whois, iptraf, ethereal,

nmap, xnmap

2. Job Scheduling1. crontab

2. at

3. Firewall & iptables

1. iptables4. Utilities and their usage

1. general utilities

1. date, cal2. uname

3. which, who, w, whoami, locate, find, whereis

4. bc, dc5. pushd, popd

2. shell programming

1. condition statements if, test2. assignment

3. comparison

4. loops

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5. exit codes

3. filters

1. awk

2. sed3. grep

4. cut

5. paste6. tr

7. head

8. tail9. more

10. less

11. tac

12. sort13. uniq

14. comm

15. diff4. redirections

1. >

2. >

4.