在bash中使用IFS使用\ r \ n分割字符串 [英] Split string using \r\n using IFS in bash

问题描述

我想在bash中拆分包含\ r \ n的字符串，但回车和\ n发出问题.谁能给我提示使用不同的IFS?我也尝试过IFS ='| \'.

I would like to split string contains \r\n in bash but carriage return and \n gives issue. Can anyone give me hint for different IFS? I tried IFS=' |\' too.

projects.google.tests.inbox.document_01\r\nprojects.google.tests.inbox.document_02\r\nprojects.google.tests.inbox.global_02

代码:

IFS=$'\r'
inputData="projects.google.tests.inbox.document_01\r\nprojects.google.tests.inbox.document_02\r\nprojects.google.tests.inbox.global_02"
for line1 in ${inputData}; do
    line2=`echo "${line1}"`
    echo ${line2} //Expected one by one entry
done

预期:

projects.google.tests.inbox.document_01
projects.google.tests.inbox.document_02
projects.google.tests.inbox.global_02

推荐答案

遵循awk可以帮助您解决问题.

Following awk could help you in your question.

awk '{gsub(/\\r\\n/,RS)} 1'  Input_file

OR

echo "$var" | awk '{gsub(/\\r\\n/,RS)} 1'

输出如下.

projects.google.tests.inbox.document_01
projects.google.tests.inbox.document_02
projects.google.tests.inbox.global_02

说明: :使用awk的gsub实用程序(用于全局替换)，其方法为gsub(/regex_to_be_subsituted/,variable/new_value,current_line/variable)，因此在这里我给出(这里需要指出的是，我在这里转义了\\，这意味着它将把它当作文字字符)与当前行中的RS(记录分隔符，其默认值为新行)一起使用.然后1表示awk使用条件和操作方法，因此提及1时，我将条件设为TRUE，并且未给出任何操作，因此将发生当前操作的默认操作.

Explanation: Using awk's gsub utility which is used for globally substitution and it's method is gsub(/regex_to_be_subsituted/,variable/new_value,current_line/variable), so here I am giving \\r\\n(point to be noted here I am escaping here \\ which means it will take it as a literal character) with RS(record separator, whose default value is new line) in the current line. Then 1 means, awk works on method of condition and action, so by mentioning 1 I am making condition as TRUE and no action is given, so default action print of current will happen.

使用变量，您可以按以下方式使用.

With a variable you could use as following.

var="projects.google.tests.inbox.document_01\r\nprojects.google.tests.inbox.document_02\r\nprojects.google.tests.inbox.global_02"
echo "$var" | awk '{gsub(/\\r\\n/,RS)} 1'
projects.google.tests.inbox.document_01
projects.google.tests.inbox.document_02
projects.google.tests.inbox.global_02

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