如何替换xml文件中的变量名?

问题描述：

java构建工具ant提供了过滤器，可将变量替换为其值

The java build tool ant provides filter to replace variables by their values

示例: 具有以下属性的文件:

Example: A file with properties:

db.user.name=user
db.driver=com.informix.jdbc.IfxDriver

具有通用设置的XML文件(请注意@ variables @)

A XML file with generic settings (Note the @variables@ )

<driver-class>@db.driver@</driver-class>
<user-name>@db.user.name@</user-name>

在使用过滤器应对后

<driver-class>com.informix.jdbc.IfxDriver</driver-class>
<user-name>user</user-name>

如何使用bash和普通的unix工具实现此功能?

How can this functionallity be achieved with bash and plain unix tools?

答

这是仅使用bash的另一种实现.如果您可以根据需要使用python版本，我建议您这样做.它将更易于维护.否则，您可以尝试使用以下bash脚本:

This is an other implementation using bash only. If you can take the python version for you need I would suggest that. It will be easier to maintain. Otherwise you could try with this bash script:

#!/bin/bash

config="$1"
xml="$2"

tmp=$(mktemp)

cat "$config" | while read line; do

    key=`echo $line | sed -n 's/^\([^=]\+\)=\(.*\)$/\1/p'`
    value=`echo $line | sed -n 's/^\([^=]\+\)=\(.*\)$/\2/p'`

    echo " sed 's/@$key@/$value/g' | " >> $tmp
done
replacement_cmd=`cat $tmp`
eval "cat \"$xml\" | $replacement_cmd cat"

rm -f $tmp

如何替换xml文件中的变量名?

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