bash - 如何启用历史来记录 here-document 及其输入？

Question

当我使用命令行时，我可以使用 C-P 或向上箭头来调用历史记录。但是，这在尝试调用此处文档的输入时不起作用。

# cat <<!
> a
> b
> c
> !
a
b
c
# cat <<! # C-p to get here, expected to see ! as last input. C-c to break out
# history 2
2053  cat <<!
2054  history 2

我正在使用 rxvt。

附言在 emacs

中使用 shell 时，此功能正常工作

Answer 1

shopt -s cmdhist

cat <<!
a
b
c
!

history | tail ...
8580  cat <<!
a
b
c
!

The cmdhist shell option, if enabled, causes the shell to attempt to save each line of a multi-line command in the same history entry, adding semicolons where necessary to preserve syntactic correctness.

The lithist shell option causes the shell to save the command with embedded newlines instead of semicolons.

From man bash