Maven variables : ${var}
ksh variable :${var}

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-resources-plugin</artifactId>
    <version><fillInLatestVersion></version>
    <configuration>
      ...
      <escapeString></escapeString>
      ...
    </configuration>
  </plugin>

Maven variables : ${var}
ksh variable : ${var}