How do I paste multi-line bash codes into terminal and run it all at once?

Question

Try putting \ at the end of each line before copying it.

Example:

echo "Hello world" && \
script_b.sh

echo $?

The exit code ($?) is now the full sequence of commands, and not just the last command.

I'm really surprised this answer isn't offered here, I was in search of a solution to this question and I think this is the easiest approach, and more flexible/forgiving...

If you'd like to paste multiple lines from a website/text editor/etc., into bash, regardless of whether it's commands per line or a function or entire script... simply start with a ( and end with a ) and Enter, like in the following example:

If I had the following blob

function hello {
    echo Hello!
}
hello

You can paste and verify in a terminal using bash by:

1. Starting with (

2. Pasting your text, and pressing Enter (to make it pretty)... or not

3. Ending with a ) and pressing Enter

Example:

imac:~ home$ ( function hello {
>     echo Hello!
> }
> hello
> )
Hello!
imac:~ home$ 

The pasted text automatically gets continued with a prepending > for each line. I've tested with multiple lines with commands per line, functions and entire scripts. Hope this helps others save some time!

If you press C-x C-e command that will open your default editor which defined .bashrc, after that you can use all powerful features of your editor. When you save and exit, the lines will wait your enter.

If you want to define your editor, just write for Ex. EDITOR=emacs -nw or EDITOR=vi inside of ~/.bashrc

In addition to backslash, if a line ends with | or && or ||, it will be continued on the next line.