bash 从文件读取时如何保留反斜杠？
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How to keep backslash when reading from a file?
提问by paler
When I use "cat test.file", it will show
当我使用“cat test.file”时，它会显示
printf "This is a test log %d \n, testid";
1
2
When I use the bash file,
当我使用 bash 文件时，
IFS=""
while read data
do
echo "$data"
done << test.file
It will show
它会显示
printf "This is a test log %d n, testid";
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2
The "\" is gone.
“\”不见了。
Is there any way that I can keep the "\" and space at the same time?
有什么办法可以同时保留“\”和空格？
回答by Lynch
Try using read -r.
尝试使用read -r.
From the man page:
从手册页：
-r
If this option is given, backslash does not act as an escape character. The backslash is considered to be part of the line. In particular, a backslash-newline pair may not be used as a line continuation.
-r
如果给出这个选项，反斜杠不作为转义字符。反斜杠被认为是行的一部分。特别是，反斜杠-换行符对不能用作换行符。
Execute this to test it:
执行这个来测试它：
read -r a < <(echo "test \n test"); echo $a
回答by Satyajit
data="$(cat < test.file)"
for line in $data
do
echo "$line"
done
回答by jedwards
#!/bin/bash
# Store the original IFS
OIFS="$IFS"
# Update the IFS to only include newline
IFS=$'\n'
# Do what you gotta do...
for line in $(<test.file) ; do
echo "$line"
done
# Reset IFS
IFS="$OIFS"
Pretty much where you were headed with the IFS plus Keith Thompson's suggestion.
IFS 和 Keith Thompson 的建议与您的目标差不多。
