It is essential to make file format or protocol extensible.
-*- mode: outline; coding: utf-8; -*-
* How cpu busy?
$ top
* How many free memory?
$ free -t
total used free shared buffers cached
Mem: 1028732 91928 936804 0 5396 34936
-/+ buffers/cache: 51596 977136
Swap: 1048568 0 1048568
Total: 2077300 91928 1985372
or
$ vmstat
procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
0 0 0 936804 5460 34936 0 0 21 5 363 29 0 0 99 0