Add a shebang: Autofix/Online suggestion

[stdedos]

For bugs

• Rule Id (if any, e.g. SC1000): SC2148
• My shellcheck version (shellcheck --version or "online"): online
• The rule's wiki page does not already cover this (e.g. https://shellcheck.net/wiki/SC2086)
• I tried on shellcheck.net and verified that this is still a problem on the latest commit

For new checks and feature suggestions

• shellcheck.net (i.e. the latest commit) currently gives no useful warnings about this
• I searched through https://github.com/koalaman/shellcheck/issues and didn't find anything related

Here's a snippet or screenshot that shows the problem:

Sometimes, I am trying to check one piece of code, rather than an entire file and/or I am building a command chain for the terminal. I'd like shellcheck to show me the way, but shebang can be a repetitive task.

Here's what shellcheck currently says:

^-- SC2148: Tips depend on target shell and yours is unknown. Add a shebang.

Here's what I wanted or expected to see:

^-- SC2148: Tips depend on target shell and yours is unknown. Add a shebang. #!/bin/bash, #!/bin/dash, #!/bin/sh, #!/bin/ksh

With hyperlink-autofix on the warning (like here) or on the "top bar"