Documents '-I' option (from Scala REPL) in spark-shell

Author: HyukjinKwon

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"
 
 # SPARK-4161: scala does not assume use of the java classpath,
 # so we need to add the "-Dscala.usejavacp=true" flag manually. We

bin/spark-shell2.cmd

@@ -20,7 +20,13 @@ rem
 rem Figure out where the Spark framework is installed
 call "%~dp0find-spark-home.cmd"
 
-set _SPARK_CMD_USAGE=Usage: .\bin\spark-shell.cmd [options]
+set LF=^
+
+
+rem two empty lines are required
+set _SPARK_CMD_USAGE=Usage: .\bin\spark-shell.cmd [options]^%LF%%LF%^%LF%%LF%^
+Scala REPL options:^%LF%%LF%^
+  -I ^<file^>                   preload ^<file^>, enforcing line-by-line interpretation
 
 rem SPARK-4161: scala does not assume use of the java classpath,
 rem so we need to add the "-Dscala.usejavacp=true" flag manually. We