Thanks for the review @TisonKun , @dawidwys `bash -x` do helps, but my sencairo is a little different. I am using `bin/flink` in third party tools (notebook) to launch flink. The output of `bin/flink` command will be logged in log file, so printing the flink command is very useful for diagnosis, and `bash -x` will be too verbose and it is not so convenient to switch between `bash -x bin/flink` and `bin/flink` for me. In contrast, setting env variable `PRINT_FLINK_COMMAND` is very convenient for me. Does this scenario make sense to you ?
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