bash - How do you retain trailing newlines when storing command output in a variable?

Question

Is it possible to retain trailing newlines when storing the output of a command in a variable?

$ echo "foo
" # newline appears after foo
foo

$ MYVAR="$(echo "foo
")"
$ echo "${MYVAR}" # newline is stripped
foo
$ 

Answer 1

您可以在流的末尾添加一个哨兵：

$ my_var=$'foo\n\n'
$ captured=$( echo -n "$my_var"; echo -n "x" )

然后删除：

$ captured=${captured%x}
$ echo "$captured"