GNU Info

(autoconf.info)Programming in M4sh

---

Prev: Programming in M4sugar Up: Programming in M4

---

Enter node , (file) or (file)node

Programming in M4sh
===================

   M4sh provides portable alternatives for some common shell constructs
that unfortunately are not portable in practice.

 - Macro: AS_DIRNAME (PATHNAME)
     Return the directory portion of PATHNAME, using the algorithm
     required by POSIX.  Note: Limitations of Usual Tools, for more
     details about what this returns and why it is more portable than
     the `dirname' command.