There's a bug that will prevent install_solr_service.sh from working on
RHEL / CentOS 6.5.  It works on Ubuntu 14.  Appears to be some obscure
difference in bash expression evaluation behavior.

line 87 and 89:    SOLR_DIR=${SOLR_INSTALL_FILE:0:-4}

blows up with this error:

./install_solr_service.sh: line 87: -4: substring expression < 0

this results in the archive not being extracted and rest of the script
won't work.

I tested a simple change:
  SOLR_DIR=${SOLR_INSTALL_FILE%.tgz}
and verified it works on both RHEL 6.5 and Ubuntu 14

I'm happy to create a Jira and submit a patch.  Never made a commit to solr
so just wanted to post up here before moving forward on the Jira and patch.

FYI - I also verified that even on a freshly installed RHEL 6.5 AWS AMI
that it's broken.

Thanks,
- Dave

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