将多行输出捕获到Bash变量中 [英] Capturing multiple line output into a Bash variable

问题描述

我有一个脚本"myscript"，它输出以下内容:

I've got a script 'myscript' that outputs the following:

abc
def
ghi

在另一个脚本中，我呼叫:

in another script, I call:

declare RESULT=$(./myscript)

和$RESULT获取值

abc def ghi

是否可以用换行符或'\ n'字符存储结果，以便可以用'echo -e'输出?

Is there a way to store the result either with the newlines, or with '\n' character so I can output it with 'echo -e'?

推荐答案

实际上，RESULT包含您想要的内容-进行演示:

Actually, RESULT contains what you want — to demonstrate:

echo "$RESULT"

您显示的是您从中得到的:

What you show is what you get from:

echo $RESULT

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如评论中所述，区别在于(1)变量的双引号版本(echo "$RESULT")保留值的内部间距与变量中表示的值完全相同-换行符，制表符，多个空格和所有-而(2)未引用版本(echo $RESULT)用一个空格替换一个或多个空格，制表符和换行符的每个序列.因此，(1)保留输入变量的形状，而(2)创建一个可能很长的单行输出，其中单词"由单个空格分隔(其中单词"是非空白字符的序列；需要不能是任何单词中的任何字母数字.)

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As noted in the comments, the difference is that (1) the double-quoted version of the variable (echo "$RESULT") preserves internal spacing of the value exactly as it is represented in the variable — newlines, tabs, multiple blanks and all — whereas (2) the unquoted version (echo $RESULT) replaces each sequence of one or more blanks, tabs and newlines with a single space. Thus (1) preserves the shape of the input variable, whereas (2) creates a potentially very long single line of output with 'words' separated by single spaces (where a 'word' is a sequence of non-whitespace characters; there needn't be any alphanumerics in any of the words).

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