1. Use lsof
lsof -i: port number to see if a port is occupied
lsof is not installed error: -bash: lsof: command not found
lsof install: yum install lsof
2. Use the netstat
use netstat -anp | grep 80
---- Linux operating system [see] an occupation occupied port
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Origin blog.csdn.net/ningjiebing/article/details/89410923
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