bash 在 shell 脚本中回显空行的首选方法是什么？
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What is the preferred method to echo a blank line in a shell script?
提问by jgr208
I am currently writing some code for a shell script that needs a blank line between two parts of the script, as thus they can be separated when output is displayed to the user.
我目前正在为 shell 脚本编写一些代码，该脚本的两个部分之间需要一个空行，因此在向用户显示输出时可以将它们分开。
My question is, I am not sure what the preferred practice is in a shell script for a blank line.
我的问题是，我不确定 shell 脚本中空行的首选做法是什么。
Is it preferred practice to just write echoand nothing else or to write echo " "as in echo with quotes and blank between the quotes?
是首选的做法是只写echo而不用别的，还是echo " "用引号和引号之间的空白来写？
回答by John Kugelman
echois preferred. echo " "outputs an unnecessary space character. echo ""would be better, but it's unnecessary.
echo是首选。echo " "输出一个不必要的空格字符。echo ""会更好，但这是不必要的。
回答by wyanez
but you can use
但你可以使用
echo -e "Hi \n"
and print a blank line after Hi, with -e interprets the \n character.
并在 Hi 之后打印一个空行， -e 解释 \n 字符。
回答by SLePort
In its first implementation, echohad no option and outputs optional arguments ending with a new line, so it perfectly suit your needs.
在它的第一个实现中，echo没有选项并输出以新行结尾的可选参数，因此它非常适合您的需求。
For formatted outputs ending with a new line, printfis a better choice, for example : printf "%s\n\n" "output".
对于以新行结尾的格式化输出，printf是更好的选择，例如 : printf "%s\n\n" "output"。
回答by Raman Gupta
All of these commands can be used to echo a blank line:
所有这些命令都可用于回显空白行：
echo, echo '', echo ""
echo, echo '',echo ""
We cant use echo "\n"or echo '\n'as they will give output as \nin both cases.
我们不能使用echo "\n"orecho '\n'因为它们会\n在两种情况下都提供输出。
