Watch can help you monitor the running result of a command to monitor the result changes of all commands you want
Common command parameters
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Usage: watch [-dhntv] [--differences[=cumulative]] [--help] [--interval=<n>] [--no-title] [--version] <command>
-d, --differences[=cumulative] highlight changes between updates
(cumulative means highlighting is cumulative)
-h, --help print a summary of the options
-n, --interval=<seconds> seconds to wait between updates
-v, --version print the version number
-t, --no-title turns off showing the header
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Common command display
Highlight changes in the number of network links every second
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watch -n 1 -d netstat -ant 【-n 设置间隔，-d,difference，高亮显示不同】
watch -d 'ls /home/omd' 【-d 高亮显示】
watch -t 'ls /home/omd' 【-t会关闭watch命令在顶部的时间间隔】
说明： 切换终端： Ctrl+x 退出watch：Ctrl+g
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Highlight changes in the number of http links every second
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watch -n 1 -d 'pstree|grep http'
实时查看模拟攻击客户机建立起来的连接数
watch -n 1 -d 'netstat -an | grep "21" | egrep "192.168.25.100"| wc -l'
监测当前目录中 scf' 的文件的变化
watch -d 'ls -l|grep scf'
10秒一次输出系统的平均负载
watch -n 1 -d "uptime"
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