bash - How replace variable names in an xml-file?

Question

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

Example: A file with properties:

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

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

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

becomes after coping using the filter

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

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

Answer 1

sed -e 's/@db.driver@/com.informix.jdbc.IfxDriver/g' -e 's/@db.user.name@/user/g' > outfile.xml