Just put the shebang at the top of your script:

#! /usr/bin/env bash

I’m not a big fan of extensions because if you put the script in your $PATH it’s weird to type do_the_thing.bash

If we’re talking specifically about executable scripts, here is #bash’s (libera.chat) factoid on the matter:

Don’t use extensions for your scripts. Scripts define new commands that you can run, and commands are generally not given extensions. Do you run ls.elf? Also: bash scripts are not sh scripts (so don’t use .sh) and the extension will only cause dependencies headaches if the script gets rewritten in another language. See http://www.talisman.org/~erlkonig/documents/commandname-extensions-considered-harmful

It’s for these reasons that I keep my executable scripts named without extensions (e.g. install).

I sometimes have non-executable scripts: they’re chmod -x, they don’t have a shebang, and they’re explicitly made for source-ing (e.g. library functions). For these, I give them an extension depending on what shell I wrote them for (and thus, what shell you need to use to source them), e.g. library.bash or library.zsh.

Usually I have most of my (admittedly very few) scripts be .sh with #!/bin/bash. I do have a few that don’t have an extension however, and those are in my $PATH intended to be used as shell commands

I stopped using extensions on anything meant to be an “executable” since it leaves me with the option to switch it’s implementation. e.g. shell to python or some binary

I just drop it. Very little reason to use it when my ~/bin is nothing but shell script. If I made the script with the intention to share, .bash for bash specific script, .sh for POSIX compliant script.

I usually add the .sh to the scripts in my ~/bin folder. Just so when I go to edit them I know if they are a script or a binary or whatever.

On my personal computer, ~/bin has two directories within it.

One is for my .sh files and the other contains system links to them. The system link drops off the .sh and all scripts are added to my PATH

Just put the shebang at the top of your script:

#! /usr/bin/env bash

I’m not a big fan of extensions because if you put the script in your $PATH it’s weird to type do_the_thing.bash