X-Git-Url: https://diplodocus.org/git/nmh/blobdiff_plain/f064e80eac20967124b9dfc154d24a58de74b623..a1829d0ea1260a9e361191054d84242a9b7f0f15:/test/README

diff --git a/test/README b/test/README
index 7bf605b5..1932cd76 100644
--- a/test/README
+++ b/test/README
@@ -71,6 +71,14 @@ in the test scripts.  In particular:
 - Avoid depending on the exact format of output from system (non-nmh)
   programs.
 
+The Heirloom Bourne Shell, http://heirloom.sourceforge.net/sh.html,
+catches many non-portable shell constructs, such as $(), $(()), !, and
+assignment in export statements.
+
 checkbashisms, available at http://sourceforge.net/projects/checkbaskisms/,
 might help some catch problems.  Though it misses all of the troublesome
 constructs, except for assignment in an export statement, listed above.
+
+The "Portable Shell" section of the Autoconf info manual has a wealth
+of tips for avoiding portability problems in shell scripts.  It might
+be available by entering:  info autoconf portable.