this comand:
top -n1 | awk '/load average:/ {print $12}'
sometimes is wrong
because when we enter "top -n1"，there are two sitiations：
top - 10:44:20 up **1 day,** 18:47, 2 users, load average: 0.30, 0.22, 0.19
and
top - 10:44:20 up **1:10,** 18:47, 2 users, load average: 0.30, 0.22, 0.19
the up time is different，so “print $12” may get the wrong result.
this comand:
top -n1 | awk '/load average:/ {print $12}'sometimes is wrong
because when we enter "top -n1"，there are two sitiations：
top - 10:44:20 up **1 day,** 18:47, 2 users, load average: 0.30, 0.22, 0.19and
top - 10:44:20 up **1:10,** 18:47, 2 users, load average: 0.30, 0.22, 0.19the up time is different，so “print $12” may get the wrong result.