One can use:
IFS= read -i "$var" -red $'\r' var
In bash as the equivalent of zsh's
vared var
To edit the content of a variable (with the added restriction
that $var can't contain CR or NUL characters), using ^V^J to
embed newline characters.
But I find that after I run that command and return to the
prompt, pressing Enter inserts ^M instead of accepting the
current line. It seems it only happens with -d $'\r'
$ INPUTRC=/dev/null ./bash --norc
bash-5.0$ echo "$BASH_VERSION"
5.0.7(3)-maint
bash-5.0$ IFS= read -i "$var" -red $'\r' var
foo
bash-5.0$ echo "$var"^M^M^M^M^M
(those ^M resulting of me pressing Enter as many times. I can
accept the current line by pressing Ctrl+J).
That's on GNU/Linux amd64 with the current git head. Same in 4.4.19.
Another related issue with read -ed ''
bash-5.0$ IFS= read -rep 'prompt> ' -d '' var
prompt> asd
prompt> qwe
prompt>
bash-5.0$ echo "$var"
asdqwe
Entering ^@ doesn't end the "read" but instead reissues a prompt
for more until I enter ^@ on an empty input.
It may also be worth documenting that the argument to -d cannot
be a multi-byte character, or that only the first byte (not
character) of the argument is taken as delimiter.
--
Stephane
