build.gradle

task replaceTest {
    doLast {
        replaceText("$projectDir/tools/app_history_a", "history.txt", "OK Google", "OK Dara")
    }
}

void replaceText(String folderPath, String match, String oldText, String newText) {
    fileTree(folderPath).matching {
        include match
    }.each {
        println it.text
        def replaced = it.text.replace(oldText, newText)
        it.setText(replaced)
    }
}