Article 6EYCD Unable to locate 'gnu' folder.

Unable to locate 'gnu' folder.

by
ajiten
from LinuxQuestions.org on (#6EYCD)
Have started to read the book on gdb, by Stallman, but he starts by mentioning about a macro processor: in gnu folder, named: m4.
The path is: /gnu/m4
But, seems the path on ubuntu is not obvious one. And, need to know some inner details of the gnu folder, but couldn't find the gnu folder either.

The first page (page #7) of the book states:
Code:One of the preliminary versions of gnu m4 (a generic macro processor) exhibits the
following bug: sometimes, when we change its quote strings from the default, the commands
used to capture one macro definition within another stop working. In the following short m4
session, we define a macro foo which expands to 0000; we then use the m4 built-in defn to
define bar as the same thing. However, when we change the open quote string to <QUOTE>
and the close quote string to <UNQUOTE>, the same procedure fails to define a new synonym
baz:
$ cd gnu/m4
$ ./m4
define(foo,0000)
foo
0000
define(bar,defn(ifooi))
bar
0000
changequote(<QUOTE>,<UNQUOTE>
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