blocks|key|549217|text|或者你可以这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|549218|echo+"usage:+up+[--level+<n>%7C+-n+<levels>][--help][--version]

Report+bugs+to:+
up+home+page:+"|code-block|syntax|javascript|549219|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

or you can do this:

<pre><code>echo "usage: up [--level &lt;n&gt;| -n &lt;levels&gt;][--help][--version]

Report bugs to: 
up home page: "
</code></pre>

blocks|key|332702|text|这里的文档通常用于此目的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|332703|cat+<<+EOF
usage:+up+[--level+<n>%7C+-n+<levels>][--help][--version]

Report+bugs+to:+
up+home+page:
EOF|code-block|syntax|javascript|332704|所有从Bourne派生的shell都支持它们，包括所有版本的Bash。|332705|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Here documents are often used for this purpose.

<pre><code>cat &lt;&lt; EOF
usage: up [--level &lt;n&gt;| -n &lt;levels&gt;][--help][--version]

Report bugs to: 
up home page:
EOF
</code></pre>

They are supported in all Bourne-derived shells including all versions of Bash.

blocks|key|332836|text|受本页上富有洞察力的答案的启发，我创建了一种混合方法，我认为这是最简单和更灵活的方法。你认为如何？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|332837|首先，我在一个变量中定义了它的用法，这允许我在不同的上下文中重用它。格式非常简单，几乎是所见即所得，不需要添加任何控制字符。这对我来说似乎相当便携(我是在MacOS和Ubuntu上运行的)|332838|__usage="
Usage:+$(basename+$0)+[OPTIONS]

Options:
++-l,+--level+<n>++++++++++++++Something+something+something+level
++-n,+--nnnnn+<levels>+++++++++Something+something+something+n
++-h,+--help+++++++++++++++++++Something+something+something+help
++-v,+--version++++++++++++++++Something+something+something+version
"|code-block|syntax|javascript|332839|然后我可以简单地使用它作为|332840|echo+"$__usage"|332841|或者更好的是，在解析参数时，我可以在一行代码中对其进行响应：|332842|levelN=${2:?"--level:+n+is+required!""${__usage}"}|332843|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|V|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|W|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|F|7|Y|8|@]|9|@]|A|$G|H]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

Inspired by the insightful answers on this page, I created a mixed approach, which I consider the simplest and more flexible one. What do you think?

First, I define the usage in a variable, which allows me to reuse it in different contexts. The format is very simple, almost WYSIWYG, without the need to add any control characters. This seems reasonably portable to me (I ran it on MacOS and Ubuntu)

<pre><code>__usage="
Usage: $(basename $0) [OPTIONS]

Options:
 -l, --level &lt;n&gt; Something something something level
 -n, --nnnnn &lt;levels&gt; Something something something n
 -h, --help Something something something help
 -v, --version Something something something version
"
</code></pre>

Then I can simply use it as

<pre><code>echo "$__usage"
</code></pre>

or even better, when parsing parameters, I can just echo it there in a one-liner:

<pre><code>levelN=${2:?"--level: n is required!""${__usage}"}
</code></pre>

blocks|key|549557|text|使用-e参数和转义字符\n：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|549558|echo+-e+"This+will+generate+a+next+line+\nThis+new+line+is+the+result"|code-block|syntax|javascript|549559|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Use the -e argument and the escape character \n:
<pre><code>echo -e &quot;This will generate a next line \nThis new line is the result&quot;
</code></pre>

blocks|key|549614|text|还有一件事，使用带有预定义变量(这里：msg)的printf作为模板。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|549615|msg="First+line+%25s
Second+line+%25s
Third+line+%25s
"

one='additional+message+for+the+first+line'
two='2'
tri='this+is+the+last+one'

printf+"$msg"+"$one"+"$two"+"$tri"|code-block|syntax|javascript|549616|此%5E将按提供的顺序打印整个消息，并插入其他变量，而不是%25s。|549617|entityMap^0|J|3|O|6|0|0|R|2|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|X|8|@]|D|@]|E|$]]]|N|$]]

One more thing, using <code>printf</code> with predefined variable (here: <code>msg</code>) as template.
<pre><code>msg=&quot;First line %s
Second line %s
Third line %s
&quot;

one='additional message for the first line'
two='2'
tri='this is the last one'

printf &quot;$msg&quot; &quot;$one&quot; &quot;$two&quot; &quot;$tri&quot;
</code></pre>
This ^^^ will print whole message with additional vars inserted instead of <code>%s</code> in provided order.

blocks|key|332978|text|我通常使用内置的read命令，我认为它更灵活、更直观。它将一行的内容读入一个变量，并允许与特殊shell变量IFS绑定的分词。有关更多详细信息，请参阅此blog或手册页。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|332979|read+-r+-d+''+usage+<<-EOF
++++usage:+up+[--level+<n>%7C+-n+<levels>][--help][--version]+

++++Report+bugs+to:+$report+server
++++up+home+page:+$HOME
EOF
echo+"$usage"|code-block|syntax|javascript|332980|entityMap|0|LINK|mutability|MUTABLE|url|https://www.computerhope.com/unix/bash/read.htm^0|24|4|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

I usually go with the builtin read command which I think is more flexible and intuitive.
It reads the contents of a line into a variable, and allows for word splitting that is tied to the special shell variable IFS.
Refer to this <a href="https://www.computerhope.com/unix/bash/read.htm" rel="noreferrer">blog</a> or even the man page for more details.
<pre><code>read -r -d '' usage &lt;&lt;-EOF
 usage: up [--level &lt;n&gt;| -n &lt;levels&gt;][--help][--version] 

 Report bugs to: $report server
 up home page: $HOME
EOF
echo &quot;$usage&quot;
</code></pre>

blocks|key|332986|text|++++You+can+write+your
++++text
++++++++freely,
+++++++++++++++++++in+a+separate:+
+++++++++++++++++++++++++++++----file.|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|332987|然后|unstyled|332988|echo+"$(</pathto/your_multiline_file)"|332989|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|L|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|I|3|-4|5|F|7|N|8|@]|9|@]|A|$]]]|J|$]]

<pre><code> You can write your
 text
 freely,
 in a separate: 
 ----file.
</code></pre>
and then
<pre><code>echo &quot;$(&lt;/pathto/your_multiline_file)&quot;
</code></pre>

How can I output a multipline string in Bash without using multiple echo calls like so:

<pre><code>echo "usage: up [--level &lt;n&gt;| -n &lt;levels&gt;][--help][--version]"
echo 
echo "Report bugs to: "
echo "up home page: "
</code></pre>

I'm looking for a portable way to do this, using only Bash builtins.

How to output a multiline string in Bash?

Ubuntu

MacOS

如何在不使用多个echo调用的情况下在Bash中输出多行字符串：echo "usage: up [--level <n>| -n <levels>][--help][--version]"echo echo "Report bugs to: "echo "up home page: "我正在寻找一种可移植的方式来做到这...

问如何在Bash中输出多行字符串？
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