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What would you like to do?
Back in 1997, when I was a PC Support Specialist, I asked Frank Stuart, who was our systems administrator (and had already put in notice to leave), what things I'd need to know in order to "keep the wheels on" until we could find a systems administrator to replace him. He said, "no problem", and the next day emailed me the following list:
ARP/RARP
Apache
C
DNS / bind / nslookup/ resolver library
IP Addresses (class A, B, C, D) / subnetting (subnet mask)
IPC / pipes / shared memory / semaphores
IPv6
NFS
NIS
NIS+
OTP / DES / 3DES / PGP / SSL / SKIP
PRNG
RFCs
SCSI / fast-wide SCSI / differential SCSI
SMTP / POP / IMAP
Sparc Storage Array / Veritas Volume Manager
TCP vs. UDP
Usenet / rn / tin / cross-posting / control
anlpasswd
at / cron
automount
backup / restore
backup / restore / tar / ufsdump
bootp / dhcp
cat / sed / awk / grep / fgrep / egrep / diff
cgi
crack / cops / satan
crash dump analysis
csh
device drivers
du / df
expect
file perms / umask / { char, block } special files / named pipes / { hard, symbolic } links
find
finding, retrieving, configuring, compiling, and installing software
firewalls / tcp-wrappers
fork / exec / malloc / nice / renice
fsck
ftp / tftp / wu-ftp
fuser
gettys / login
host / ethers / netinfo / labels
ident
ifconfig
inetd
init.d
init / run levels
inodes / vnodes / rnodes
lex / yacc
limit / time
lp / lpd
majordomo
make
modems terminal setup & configuration
mount / unmount / tmpfs / autofs / automounter / cachefs
nfswatch
nsswitch.conf
password / shadow / useradd / adduser
perl
ping / traceroute
prestoserve
procmail
public key vs secret key crypto
sar / vmstat / iostat / netstat
sed / awk
sendmail
sh
signals / kill
snmp
snoop
static vs. dynamic linking / shared libraries
suid programs / wrappers
sum(s) / md5
syslog / swatch
tcl / tk
termcap / terminfo / curses
terminal settings / stty / tput / reset / flow control
threads
top
truss / dbx / adb
utmp / wtmp
uucp
vi
virtual memory / paging / swapping
whois database
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