Q: How do I recursively find all shell scripts in my current working directory?

A: Search for the hash-bang line:

$ git -c grep.fallbackToNoIndex=yes grep -lPe '\A#!\s*/bin/([bd]?a)?sh\b'

Explanation

I’m using Perl Compatible Regular Expressions (PCRE) as this gives us \A to match at the beginning of the subject. The circumflex (^) would match each line, not only the first line.

Then #!/bin/sh plus any other shell like Almquist shell ash, Debian Almquist Shell dash and GNU Bourne-Again SHell bash. You might want to also match C-Shell csh, TENEX C-Shell tcsh and Z-Shell zsh.

There may be blanks between #! and /bin/sh.

Instead of git grep you also can use grep -r itself, but as I have many git repositories, git grep is more efficient as it can use the index.

Issues

This will not find shell libraries, e.g. shell scripts not starting with a hash-bang line.