heredoc | npm module : multiline strings for javascript | Runtime Evironment library

I have a script (myscript.sh) which runs a few commands which need elevated privileges (i.e. needs to run with sudo).

Script is quite complex, but to demonstrate it is like below:

I'm trying to print a map variable in terraform using heredoc example :

Trying to beautify following command so I don’t have to use \n to signal like breaks.

I need to create a bunch of strings using heredocs which I want to store in an array so that I can run them all through processes later. For example

Python's standard library has a shlex.quote function that takes a string and returns one that is guaranteed to be interpreted as that same string by Unix shells. This is achieved by putting the string in single quotes and escaping any occurrences of the single quote character that appear in it.

This function is useful e.g. when you're templating out shell scripts and can't guarantee that the substituted values only contain "shell-safe" strings.

My question: Is there an equivalent of this written in pure bash with at most coreutils as a dependency? Or perhaps even a bash builtin mechanism I'm not aware of?

Minimal example to show how you would use such a utility (called shlex_quote here as a placeholder):

generate_greeting_script.sh:

I want to pass a string in a heredoc that contains a variable, and multiple "$" characters. The command without the heredoc is:

While doing the input redirection, the shell opens the file on the right side of '<' with file descriptor 0, but in the case of the heredoc there is no such file to open, I am wondering what exactly shell does in this case.

Copy following example into a terminal session;

I am writing my version of minishell and trying to implement heredoc (<<) in C. I decided to use tmpfile - first I write data from stdin to tmpfile until I reach a delimiter, then I change program's stdin to the fd of the tmpfile with dup2 and, then, try to execute cat command with execve.

I tried to simplify the program and include all relevant functions below: