canal.adapter启动报错Could not resolve placeholder ‘HOSTNAME%%.*‘

Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder 'HOSTNAME%%.*' in value "history -a; printf "\033]0;%s@%s:%s\007" "${USER}" "${HOSTNAME%%.*}" "${PWD/#$HOME/~}""

配置里面根本就不需要用到HOSTNAME%%.*，所以这下有点蒙蔽，查看相关源码也没有要读取这个HOSTNAME%%.*，不得已，用env命令看了下云服务器，发现了一个重要的变量：

PROMPT_COMMAND=history -a; printf "\033]0;%s@%s:%s\007" "${USER}" "${HOSTNAME%%.*}" "${PWD/#$HOME/~}

明显的，就是系统的变量读取方法${}跟spring boot那一套冲突了，解决的办法就是在以下配置文件中增加${}里的相关变量并赋空值（变量冒号后为空），如：PWD/#$HOME/~:

canal.adapter/conf/application.yml

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