echo $?回传值的意思：
- 0 program is running or service is OK
- 1 program is dead and /var/run pid file exists
- 2 program is dead and /var/lock lock file exists
- 3 program is not running
- 4 program or service status is unknown
- 5-99 reserved for future LSB use
- 100-149 reserved for distribution use
- 150-199 reserved for application use
- 200-254 reserved
如何查看占用端口8080的进程
lsof -i:8080
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