Pressing Ctrl + A in Selenium WebDriver

One more solution (in Java, because you didn’t tell us your language – but it works the same way in all languages with Keys class):

String selectAll = Keys.chord(Keys.CONTROL, "a");
driver.findElement(By.whatever("anything")).sendKeys(selectAll);

You can use this to select the whole text in an <input>, or on the whole page (just find the html element and send this to it).

For using Selenium Ruby bindings:

There’s no chord() method in the Keys class in Ruby bindings. Therefore, as suggested by Hari Reddy, you’ll have to use Selenium Advanced user interactions API, see ActionBuilder:

    driver.action.key_down(:control)
                 .send_keys("a")
                 .key_up(:control)
                 .perform