Github user HyukjinKwon commented on a diff in the pull request:

    https://github.com/apache/spark/pull/22919#discussion_r230675018
  
    --- Diff: bin/spark-shell ---
    @@ -32,7 +32,10 @@ if [ -z "${SPARK_HOME}" ]; then
       source "$(dirname "$0")"/find-spark-home
     fi
     
    -export _SPARK_CMD_USAGE="Usage: ./bin/spark-shell [options]"
    +export _SPARK_CMD_USAGE="Usage: ./bin/spark-shell [options]
    +
    +Scala REPL options:
    +  -I <file>                   preload <file>, enforcing line-by-line 
interpretation"
    --- End diff --
    
    I tested other options and this one looks only the valid one. I described 
in PR description.


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