apache/spark — pull request #2898 by jey (2014-10-23 00:14:04+00:00)
Title: bash can't `die`

This PR fixes the bug that `sbt/sbt` enters an infinite loop when a required argument is omitted:

```
jey@kallisti:~/proj/spark$ sbt/sbt -mem 2>&1 | head -n 10
/home/jey/proj/spark/sbt/sbt-launch-lib.bash: line 127: die: command not found
/home/jey/proj/spark/sbt/sbt-launch-lib.bash: line 127: die: command not found
/home/jey/proj/spark/sbt/sbt-launch-lib.bash: line 127: die: command not found
/home/jey/proj/spark/sbt/sbt-launch-lib.bash: line 127: die: command not found
/home/jey/proj/spark/sbt/sbt-launch-lib.bash: line 127: die: command not found
/home/jey/proj/spark/sbt/sbt-launch-lib.bash: line 127: die: command not found
/home/jey/proj/spark/sbt/sbt-launch-lib.bash: line 127: die: command not found
/home/jey/proj/spark/sbt/sbt-launch-lib.bash: line 127: die: command not found
/home/jey/proj/spark/sbt/sbt-launch-lib.bash: line 127: die: command not found
/home/jey/proj/spark/sbt/sbt-launch-lib.bash: line 127: die: command not found
[...]
```