dstat

You can not live without it

dstat is the best and simplest way to monitor everything in linux.

ali@silken:~$ dstat -tams -Dsda -Nwlan1
----system---- ----total-cpu-usage---- --dsk/sda-- -net/wlan1- ---paging-- ---system-- ------memory-usage----- ----swap---
     time     |usr sys idl wai hiq siq| read  writ| recv  send|  in   out | int   csw | used  buff  cach  free| used  free
04-08 20:04:59| 14   4  81   1   0   0|  37k   48k|   0     0 |   0     0 | 297  1170 |1712M  133M  972M  988M|   0   999M
04-08 20:05:00|  4   1  95   0   0   0|   0    12k|  62k 2395B|   0     0 | 371  1263 |1712M  133M  972M  989M|   0   999M
04-08 20:05:01|  2   1  97   0   0   0|   0     0 |  61k 2245B|   0     0 | 303  1017 |1713M  133M  972M  987M|   0   999M
04-08 20:05:02|  2   2  97   0   0   0|   0     0 |  61k 2248B|   0     0 | 327   984 |1714M  133M  972M  986M|   0   999M
04-08 20:05:03|  1   1  99   0   0   0|   0     0 |  62k 2251B|   0     0 | 296   944 |1714M  133M  972M  986M|   0   999M
04-08 20:05:04|  1   1  98   0   0   0|   0     0 |  60k 2343B|   0     0 | 272   882 |1714M  133M  972M  986M|   0   999M
04-08 20:05:05|  2   1  97   0   0   0|   0     0 |  65k 1867B|   0     0 | 352  1139 |1714M  133M  972M  986M|   0   999M
04-08 20:05:06|  2   1  97   0   0   0|   0    40k|  75k 2472B|   0     0 | 342  1035 |1714M  133M  972M  986M|   0   999M^C
ali@silken:~$