Manual:FetchText.php

fetchText.php is an interactive MediaWiki maintenance script used to fetch a particular revision text from an old_id.

Enter a text id to the command line followed by a newline, and it will output a string containing the following in order:
 * textid
 * length of text (-1 on error = failure to retrieve/unserialize/gunzip/etc)
 * text (may be empty)

Note that that the text string itself is *not* followed by newline.

You can exit from the script typing.