ShellCheck is a tool for Bash/sh shell scripts, useful, helping to find errors in shell scripts you write
if you need to use it on Mavericks you would need to compile latest ShellCheck because binaries you can download are for newer OS than Mavericks, you need a Haskell compiler for that and it takes long to build the compiler - I share binaries that you can use on Mavericks here

Don't be shy, give it a try, hesitation isn't good for you, trust me, I'm your best advisor ;-). I believe in you capability to download and set it up, after all what have you got to lose, if you don't like it you can always bin it and once you change your mind, bring it back.

DISCLAIMER
This software/resource is provided "as is" without warranty of any kind, either expressed or implied and such software is to be used at your own risk. While it was created taking many aspects and factors in mind, the use of this software/resource is done at your own discretion and risk and with agreement that you will be solely responsible for any damage to your computer system or loss of data that results from such activities. No advice or information, whether oral or written, obtained by you from us shall create any warranty for the software/resource. Additionally, we make no warranty that: (a) This software/resource will meet your requirements, (b) This software/resource will be uninterrupted, timely, secure or error-free, (c) The results from the use of this software/resource will be effective, accurate or reliable, (d) The quality of this software/resource will meet your expectations, (e) If errors or problems occur in connection with a download of this software/resource obtained from the links on this website, they will be corrected.

IMPORTANT NOTE: If you voted out of favour because you had a bad day or acted upon feeling like a spoiled toddler, be aware that I consider it as indeed very immature and silly. On contrary, if you liked what you got, definitely feel free to vote + and possibly point others to the product site, you will actually do well if you do this, unlike most who in fact can't do anything else than express negativity because they think it matters.