阅读在bash文件时preserving前导空格 [英] Preserving leading whitespace when reading a file in bash

问题描述

也许有人可以给我我的问题的线索。结果
让我们假设我有这样两行：

Maybe someone could give me a clue for my problem.
Let's suppose I have this two lines:

blablablabla
 blablablabla

（第二行开始用空格）

(the second line begins with a space)

我试图测试在我行的第一个字符：

I tried to test the first character on my line:

while read line
do
    check=${line:0:1}
done < file.txt

在这两种情况下，检查='B'！这很烦人，因为我需要这些信息用于治疗的其余部分。

In both cases, check = 'b' ! That's annoying, because I need this information for the rest of the treatment.

推荐答案

您需要指定 IFS 空字符串，这样读不丢弃开头或结尾空白：

You need to specify the empty string for IFS so that read doesn't discard leading or trailing whitespace:

while IFS= read line; do
    check=${line:0:1}
done < file.txt

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