CPU
top
sar
mpstat
w (load average)
uptime (load average)
ps
vmstat
procinfo (cat /proc/cpuinfo)
oprofile
cat /proc/cpuinfo
Memory
free
vmstat
top
procinfo (cat /proc/meminfo)
slabtop
sar -r
cat /proc/meminfo
Network I/O
ethtool
mii-tool
netstat
lsof
tcpdump
ip
iptraf
Disk I/O
sar -d
iostat
vmstat
lsof
Disk Space
df
du
Application
ps -ef
strace -p <pid>
gdb <binary> <corefile> (then where then quit)
http://www.datadisk.co.uk/html_docs/misc/unix_commands.htm
