在bash脚本中，以下工作:

#!/bin/sh

text="this is line one\nthis is line two\nthis is line three"
echo -e $text > filename

另外:

text="this is line one
this is line two
this is line three"
echo "$text" > filename

Cat文件名给出:

this is line one
this is line two
this is line three

Echo在传递给它的参数之间添加空格。$text受变量扩展和单词分割的影响，所以你的echo命令相当于:

echo -e "this" "is" "line" "one\n" "this" "is" "line" "two\n"  ...

你可以看到在“this”之前加了一个空格。你可以删除换行符，并引用$text来保留换行符:

text="this is line one
this is line two
this is line three"

echo "$text" > filename

或者你可以使用printf，它比echo更健壮和可移植:

printf "%s\n" "this is line one" "this is line two" "this is line three" > filename

在支持大括号展开的bash中，你甚至可以这样做:

printf "%s\n" "this is line "{one,two,three} > filename

如果你试图将字符串转换为变量，另一种简单的方法是这样的:

USAGE=$(cat <<-END
    This is line one.
    This is line two.
    This is line three.
END

)

如果你用制表符缩进字符串(例如，'\t')，缩进将被删除。如果使用空格缩进，则缩进将保留。

注意:最后一个右括号在另一行，这很重要。END文本必须单独出现在一行中。

这里只提一个简单的单行连接，因为它有时很有用。

# for bash

v=" guga "$'\n'"   puga "

# Just for an example.
v2="bar "$'\n'"   foo "$'\n'"$v"

# Let's simplify the previous version of $v2.
n=$'\n'
v3="bar ${n}   foo ${n}$v"

echo "$v3" 

你会得到这样的结果

bar 
   foo 
 guga 
   puga 

所有前导和结尾空格将被保留

echo "$v3" > filename

下面是我喜欢的方式来分配一个多行字符串的变量(我认为它看起来不错)。

read -r -d '' my_variable << \
_______________________________________________________________________________

String1
String2
String3
...
StringN
_______________________________________________________________________________

在这两种情况下，下划线的数量是相同的(这里是80)。

我发现了更多的解决方案，因为我想有每一行适当缩进:

You may use echo: echo "this is line one" \ "\n""this is line two" \ "\n""this is line three" \ > filename It does not work if you put "\n" just before \ on the end of a line. Alternatively, you can use printf for better portability (I happened to have a lot of problems with echo): printf '%s\n' \ "this is line one" \ "this is line two" \ "this is line three" \ > filename Yet another solution might be: text='' text="${text}this is line one\n" text="${text}this is line two\n" text="${text}this is line three\n" printf "%b" "$text" > filename or text='' text+="this is line one\n" text+="this is line two\n" text+="this is line three\n" printf "%b" "$text" > filename Another solution is achieved by mixing printf and sed. if something then printf '%s' ' this is line one this is line two this is line three ' | sed '1d;$d;s/^ //g' fi It is not easy to refactor code formatted like this as you hardcode the indentation level into the code. It is possible to use a helper function and some variable substitution tricks: unset text _() { text="${text}${text+ }${*}"; } # That's an empty line which demonstrates the reasoning behind # the usage of "+" instead of ":+" in the variable substitution # above. _ "" _ "this is line one" _ "this is line two" _ "this is line three" unset -f _ printf '%s' "$text"