CPU

Display statistics for all processors at 1 second intervals.
```
mpstat -P ALL 1
```

Memory

Display memory statistics at 1 second intervals with human readable format.
```
sar -r --human 1
```

IO

Display extended statistics at 1 second intervals for device dev.
```
iostat --human -x $dev 1
```

Network

Display network statistics at 1 second intervals for the network interface eth0.
```
sar --human -n DEV --iface=eth0 1
```

Sockets

display listening TCP and UDP sockets
```
ss -nltup
```
dispaloy both listening and non-listening TCP and UDP sockets
```
ss -atup
```
example of state filter
```
ss -p state established 'dport = 5432'
```

Links

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