用 VIM 快速修改 Tomcat 的端口
在一台机器上运行多个 Tomcat 的时候，需要修改 server.xml 中的好几个端口。
vim $CATALINA_HOME/conf/server.xml
在 VIM 中用下面的替换可以迅速的给每个端口加1，也就是把 8080 变成了 8081，等等
:%s/\([pP]ort\)="\([0-9]\+\)"/\=printf("%s=\"%d\"",submatch(1),submatch(2)+1)/g
或者用下面的替换可以迅速的给每个端口前增加一个数字，下面的例子是增加 4，也就是把 8080 变成了 48080，等等
:%s/\([pP]ort\)="\([0-9]\+\)"/\1="4\2"/g
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