我们知道一般的sed文本替换命令格式如下：
sed -e "s/origin/new/g" input.txt
但当我们要替换的东西或替换后的东西不再像origin或new这样，而是一个路径时怎么办呢？
答案是转义！！
例如我有以下input.txt的文本
1. set path VARPATH running workspace. 2. runing this program
我想把里面的VARPATH替换为/var/tmp/cloud，用shell脚本实现如下：
!/bin/sh
###########################################################
# sedpath.sh
# this script is used to deal with sed replace with path
###########################################################
VARPATH="/var/tmp/cloud"
VARPATHSED=$(echo ${VARPATH} |sed -e 's/\//\\\//g' )
echo "origin content:"
echo "-----------------"
cat input.txt
echo "-----------------"
echo "VARPATH=${VARPATH}"
echo "VARPATHSED=${VARPATHSED}"
cat input.txt |sed -e "s/VARPATH/${VARPATHSED}/g" > output.txt
echo "the result content:"
echo "-----------------"
cat output.txt
echo "-----------------"
运行结果如下：
