shell中使用read如何换行

例如：

read -p $'Please Enter the percent [30 between 100]\x0a The value is  Default = 80   :' scale_percent

we use above syntax to insert hex values, we insert \x0a which is the hexadecimal value of the newline character (LF). You can use same syntax above with echo to produce new lines, eg:

echo $'One line\x0asecond line'

This is a feature of BASH 2, it is documented here, the $'' is used to translate all escape sequences inside it for its ascii transcription. So we could obtain the same result of example above, this way:

echo $'One line\nsecond line'

注意要用单引号