Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/13308#discussion_r64678560
--- Diff: R/install-dev.sh ---
@@ -38,7 +38,12 @@ pushd $FWDIR > /dev/null
if [ ! -z "$R_HOME" ]
then
R_SCRIPT_PATH="$R_HOME/bin"
- else
+ else
+ # if command 'which R' finds no R home, then exit
+ if ! which R >/dev/null; then
--- End diff --
I think "command" is the preferred way to do this. See how java is detected
in `spark-class`.
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