Re: \n displayed instead of newline

[Greg Wooledge]

On Wed, Jun 30, 2021 at 03:07:19PM +0200, lisa-asket@perso.be wrote:
> >From: Greg Wooledge <greg@wooledge.org>
> >cat <<'EOF'
> >Usage: grep -ir --exclude=\*.el --include=\*.{orig,texi} \
> >-C 8 "hilbert" /marshall/
> >EOF
> 
> >Just place the entire message directly into the script, exactly as you
> >want it to be printed. (There's a tab-indented variant, if you want to
> 
> >go down that road, but start with the simpler version first.)
> 
> 
> 
> Does 'EOF' do a different thing than "EOF".

They're identical.  In both cases, three of the characters of the
here-document sentinel have been quoted.

When *any* character of the here-document sentinel is quoted, no
substitutions are performed inside the here-document.

Therefore, all of the following are equivalent:

cat <<'EOF'
cat <<"EOF"
cat <<\E\O\F
cat <<\EOF
cat <<EO"F"

and so on.  The only variant that is NOT equivalent is the one where zero
characters are quoted:

cat <<EOF

In that one, some substitutions (parameter expansion, command substitution,
and so on) are performed in the here-document.

In this particular example, it doesn't matter, because there aren't any
substitutions in the usage text.  But I don't know how much more text
you were planning to add, so I figured I'd use the "safer" choice.