Output system statistics every 5 seconds with timestamp

while [ 1 ]; do echo -n "`date +%F_%T`" ; vmstat 1 2 | tail -1 ; sleep 4; done
See man vmstat for information about the statistics. This does the same thing without the timestamp: vmstat 5
Sample Output
2009-03-26_15:13:49 0  0    536  27724   4236 699064    0    0     0     0 1306   413  2  1 98  0
2009-03-26_15:13:54 0  0    536  27212   4244 699576    0    0     0     0 1182   266  1  0 99  0
2009-03-26_15:13:59 0  0    536  26764   4252 699828    0    0     0     0 1229   330  1  0 98  0
2009-03-26_15:14:04 0  0    536  26508   4260 700080    0    0     0     0 1307   465  2  1 98  0

3
2009-03-26 19:16:55

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