Can we not use sh here?

Question

bash is the default login shell in Ubuntu. Most users use bash for scripting. Some answers use sh as the interpreter, even if the question mentioned bash (force of habit, I assume). (For example, a question about adding commands to startup, or creating launchers.) This can lead to problems where the user has unknowingly used a bashism, and then later on:

But that didn't work! I get some weird error!!1! :(

This also applies to answers where complex shell commands have to be used, such as:

sudo sh -c ...
gnome-terminal -x sh -c ...

Where using bash may simply make things more easier (at the cost of two letters).

Those who are smart enough to use a different shell known enough to substitute the correct shell.

Unless sh-compatibility is known for certain, we should refrain from using it at all.

Answer 1

I see no reason not to use sh. On the other hand, answers that use it and include bashisms should be edited. On Ubuntu, sh is actually dash not sh but, again, that should be irrelevant in most cases.

So, a simple answer suggesting something like

#!/bin/sh
echo foo

is fine. There are valid reasons to use sh (whether it be actual sh or dash or even bash called as sh which changes its behavior). Startup scripts for example benefit from the greater speed of a lighter shell. An answer that uses the more advanced features of bash (such as arrays) will not work with sh so it is wrong and should be downvoted/edited but I see no reason to ban sh outright.

So no, I would suggest the inverse. Unless something is known not to work with sh, use it freely. If nothing else, it will make answers more portable which is a good thing despite the site's being focused on Ubuntu.