How to use an environment var in a property file

Discussion in 'Java' started by coltrane, Mar 8, 2006.

  1. coltrane

    coltrane Guest

    Is it possible to use an environment variable in a property file?

    I would like to set a property such as
    where INSTALL_BASE is an env var.

    then I would like to use ${dir.base} with a build.xml.

    why do you ask would I want to do this???

    I inherited a group of ant build scripts with hard coded paths in the
    property files.
    I would like to change them so the paths can be changed without
    modifying the prop files.

    I am very new to ant so forgive me if this is a simple question. and
    yes I am reading the manual :)

    thanks for your help

    coltrane, Mar 8, 2006
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  2. coltrane

    Ashish Pagey Guest

    You can pull in environment variables as properties into ant by using
    the property tag:

    <property environment="env"/>
    <echo message="Installbase = ${env.INSTALL_BASE}"/>

    Ashish Pagey, Mar 8, 2006
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  3. coltrane

    coltrane Guest


    I cannot alter my ant files but I can alter my property files.What I
    would like to do is use environment variables in the properties file.

    This is a sample of what I have

    property file
    ant file
    now what I want is to use an environment variable in the property file
    and not touch the ant file

    property file
    ant file
    I know this seems like extra work but as I said I can't change my ant
    files and I still want to use environment files.

    coltrane, Mar 9, 2006
  4. You can override the values in the properties files by specifying them
    as system properties. E.g. (assuming UNIX-style shell):

    ant -Ddir.base=$INSTALL_BASE build

    Do not forget to use quotes when appropriate.

    Raymond DeCampo, Mar 12, 2006
  5. coltrane

    coltrane Guest

    great solution.

    coltrane, Mar 13, 2006
  6. coltrane

    [email protected]

    Jan 9, 2020
    Likes Received:
    I am using the Base URL port in Environmental variable. How can i use this env variables in properties files?
    export PORT_NUMBER=**** This is Environmental variable.
    BaseUrl=http://localhost:(have to put the env variable) : how to get that env variables?
    [email protected], Jan 9, 2020
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