Linux sed命令-在反斜杠中使用变量 [英] Linux sed command - using variable with backslash

问题描述

我正在尝试替换文件中的字符串.我必须使用变量，因为我必须在很多行中执行此操作.我如何逃避反斜杠?

I'm trying to replace a string in a file. i have to use a variable since i have to do this in alot of lines. how do i escape the backslash?

text.txt:

1234567#Hello World#Hello I\u0027m Scott

脚本:

#!/bin/bash
FOLDERID=`cat text.txt | cut -d# -f1`  # example: 12345
oldstring=`cat text.txt | cut -d# -f2` # example: "Hello World"
newstring=`cat text.txt | cut -d# -f3` # example: "Hello I\u0027m Scott"
sed -i "s/${oldstring}/${newstring}/g" $FOLDERID/myfile.txt

sed后

cat myfile.txt

cat myfile.txt after sed

Hello I0027m Scott

我怎样才能逃脱反斜线?我只知道如何转义像这样的斜杠:

how can i escape a backslash? i only know how to escape slashes which would work like:

newstring=Hello I/u0027m Scott
newstring=${newstring//\//\\\/}
echo ${newstring} # => Hello I\/u0027m Scott

推荐答案

尝试一下:

cd /tmp
mkdir -p 1234567
echo Hello World >1234567/myfile.txt
echo '1234567#Hello World#Hello I\u0027m Scott' >text.txt

那么，然后:

IFS=\# read -r FOLDERID oldstring newstring <text.txt 
sed "s/${oldstring}/${newstring//\\/\\\\}/g" -i $FOLDERID/myfile.txt
cat 1234567/myfile.txt 
Hello I\u0027m Scott

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