Text Processing
awk
and
grep
sort
uniq
cat
cut
echo
fmt
tr
nl
egrep
fgrep
wc
Process Monitoring
ps
top
htop
atop
lsof
The internet
nmap
tcpdump
ping
mtr
tracerote
airmon
airodump
you
iptables
System Performance
nmon
iostat
sar
vmstat
Compile source code
gcc
make
other
strace
dtrace
systemtop
uname
df
history