fix issue #198

Operator ``==`` is not recognized by sh scripts.
fix issue #198

Operator ``==`` is not recognized by sh scripts.
fix issue #198

Operator ``==`` is not recognized by sh scripts.
fix issue #198

Operator ``==`` is not recognized by sh scripts.
fix issue #198

Operator ``==`` is not recognized by sh scripts.
Merge pull request #199 from Arn-O/hydro-devel

change equality operator in rosrun scripts to be posix compliant