[GordonS]

Woah, I had no idea multiline strings were even a thing in Bash, I've been using heredocs for help messages since forever!

Do you know if these are portable?

[pavon]

As far as I know. The POSIX spec[1] simply declares that in single quotes all characters will be preserved exactly, except for single quotes, which aren't allowed. Likewise, for double quotes, except that it also performs expansions ($) and allows escaping (\).

[1]https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V...