Yac*_*ali 5 linux centos5 admin batch-file top-command
运行top -b -n 1时,该命令始终返回相同的CPU值.连续5次考虑以下测试运行:
[user@server ~]$ top -b -n 5 -d.2 | grep "Cpu(s)"
Cpu(s): 18.5%us, 10.0%sy, 0.0%ni, 67.0%id, 4.2%wa, 0.0%hi, 0.2%si, 0.1%st
Cpu(s): 39.8%us, 27.7%sy, 0.0%ni, 31.3%id, 0.0%wa, 0.0%hi, 1.2%si, 0.0%st
Cpu(s): 39.0%us, 35.4%sy, 0.0%ni, 23.2%id, 0.0%wa, 0.0%hi, 1.2%si, 1.2%st
Cpu(s): 41.2%us, 34.1%sy, 0.0%ni, 15.3%id, 1.2%wa, 0.0%hi, 2.4%si, 5.9%st
Cpu(s): 59.0%us, 30.1%sy, 0.0%ni, 4.8%id, 0.0%wa, 0.0%hi, 3.6%si, 2.4%st
[user@server ~]$ top -b -n 5 -d.2 | grep "Cpu(s)"
Cpu(s): 18.5%us, 10.0%sy, 0.0%ni, 67.0%id, 4.2%wa, 0.0%hi, 0.2%si, 0.1%st
Cpu(s): 18.9%us, 17.8%sy, 0.0%ni, 63.3%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu(s): 18.8%us, 21.2%sy, 0.0%ni, 55.3%id, 2.4%wa, 0.0%hi, 1.2%si, 1.2%st
Cpu(s): 29.4%us, 24.7%sy, 0.0%ni, 45.9%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu(s): 60.5%us, 24.4%sy, 0.0%ni, 11.6%id, 1.2%wa, 0.0%hi, 1.2%si, 1.2%st
[user@server ~]$ top -b -n 5 -d.2 | grep "Cpu(s)"
Cpu(s): 18.5%us, 10.0%sy, 0.0%ni, 67.0%id, 4.2%wa, 0.0%hi, 0.2%si, 0.1%st
Cpu(s): 43.4%us, 38.6%sy, 0.0%ni, 15.7%id, 0.0%wa, 0.0%hi, 1.2%si, 1.2%st
Cpu(s): 55.3%us, 40.0%sy, 0.0%ni, 4.7%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu(s): 39.5%us, 48.8%sy, 0.0%ni, 5.8%id, 1.2%wa, 0.0%hi, 1.2%si, 3.5%st
Cpu(s): 40.7%us, 55.6%sy, 0.0%ni, 2.5%id, 0.0%wa, 0.0%hi, 0.0%si, 1.2%st
[user@server ~]$ top -b -n 5 -d.2 | grep "Cpu(s)"
Cpu(s): 18.5%us, 10.0%sy, 0.0%ni, 67.0%id, 4.2%wa, 0.0%hi, 0.2%si, 0.1%st
Cpu(s): 27.1%us, 10.6%sy, 0.0%ni, 61.2%id, 1.2%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu(s): 25.3%us, 5.7%sy, 0.0%ni, 67.8%id, 0.0%wa, 0.0%hi, 0.0%si, 1.1%st
Cpu(s): 15.5%us, 16.7%sy, 0.0%ni, 64.3%id, 0.0%wa, 0.0%hi, 0.0%si, 3.6%st
Cpu(s): 57.3%us, 11.2%sy, 0.0%ni, 30.3%id, 0.0%wa, 0.0%hi, 0.0%si, 1.1%st
[user@server ~]$ top -b -n 5 -d.2 | grep "Cpu(s)"
Cpu(s): 18.5%us, 10.0%sy, 0.0%ni, 67.0%id, 4.2%wa, 0.0%hi, 0.2%si, 0.1%st
Cpu(s): 44.0%us, 6.0%sy, 0.0%ni, 42.9%id, 0.0%wa, 0.0%hi, 3.6%si, 3.6%st
Cpu(s): 45.8%us, 9.6%sy, 0.0%ni, 44.6%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu(s): 34.5%us, 8.3%sy, 0.0%ni, 57.1%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu(s): 38.6%us, 14.5%sy, 0.0%ni, 45.8%id, 0.0%wa, 0.0%hi, 0.0%si, 1.2%st
知道这里有什么问题吗？
如果有人正在寻找一行获取cpu的值,那么试试这个
top -b -n 5 -d.2 | grep "Cpu" | tail -n1 | awk '{print($2)}' | cut -d'%' -f 1
Top 在开始之前不知道进程时间计数是多少，因此它会在第一次通过时根据负载平均和等待线程等多种因素进行猜测。
如果您以交互方式启动 top 并快速检查它返回的第一批结果，您可以看到相同的效果。
简单的解决方案： top -b -n 5 -d.2 | grep "Cpu(s)" | tail -n+2