[Known Issue] grep/egrep has different versions (GNU and BSD as I've encountered), need to support both.

[dryruner]

1. On ubuntu:
   $ grep -V;
   grep (GNU grep) 2.16
   ...
   $ egrep -V;
   egrep (GNU grep) 2.16
   ...
2. On Mac OSX (BSD):
   $ grep -V;
   grep (BSD grep) 2.5.1-FreeBSD
   $ egrep -V;
   egrep (BSD grep) 2.5.1-FreeBSD

** What's the impact?

BSD greps and GNU greps has slightly different functionalities.
GNU grep supports perl-like non greedy match:
grep -P '"objURL":".?"' -o
But it doesn't work with egrep [-P] '"objURL":".?"' -o (GNU egrep is different from BSD egrep)

BSD egrep supports this by:
egrep '"objURL":".?"' -o
But it doesn't work with grep -P '"objURL":".?"' -o (BSD grep doesn't support -P)