Here is description of the tool:

Description : The goals of ShellCheck are:

• To point out and clarify typical beginner’s syntax issues,
  :   that causes a shell to give cryptic error messages.

• To point out and clarify typical intermediate level semantic
  :   problems, that causes a shell to behave strangely and
  :   counter-intuitively.

• To point out subtle caveats, corner cases and pitfalls, that may
  :   cause an advanced user’s otherwise working script to fail under
  :   future circumstances.

To install

dnf install ShellCheck

And just run the tool on the script to get the common errors.

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