X-Git-Url: https://diplodocus.org/git/nmh/blobdiff_plain/3af82657e2b0bf04758f149cdeed07e4143a151d..c525020c77134b8832587755b7c05764a0516d80:/test/README

diff --git a/test/README b/test/README
index 1ac904f2..e9dae928 100644
--- a/test/README
+++ b/test/README
@@ -70,3 +70,18 @@ in the test scripts.  In particular:
 
 - Avoid depending on the exact format of output from system (non-nmh)
   programs.
+
+- Use octal instead of hex (\x) bytes in printf(1) formats, because hex
+  is not supported by POSIX printf.
+
+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.