small ash testsuite, adapted from bash
(only a small part of it, actually)
diff --git a/shell/ash_test/printenv.c b/shell/ash_test/printenv.c
new file mode 100644
index 0000000..07ea2a9
--- /dev/null
+++ b/shell/ash_test/printenv.c
@@ -0,0 +1,67 @@
+/* printenv -- minimal clone of BSD printenv(1).
+
+ usage: printenv [varname]
+
+ Chet Ramey
+ chet@po.cwru.edu
+*/
+
+/* Copyright (C) 1997-2002 Free Software Foundation, Inc.
+
+ This file is part of GNU Bash, the Bourne Again SHell.
+
+ Bash is free software; you can redistribute it and/or modify it under
+ the terms of the GNU General Public License as published by the Free
+ Software Foundation; either version 2, or (at your option) any later
+ version.
+
+ Bash is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ for more details.
+
+ You should have received a copy of the GNU General Public License along
+ with Bash; see the file COPYING. If not, write to the Free Software
+ Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
+
+#include <stdlib.h>
+#include <string.h>
+
+extern char **environ;
+
+int
+main (argc, argv)
+ int argc;
+ char **argv;
+{
+ register char **envp, *eval;
+ int len;
+
+ argv++;
+ argc--;
+
+ /* printenv */
+ if (argc == 0)
+ {
+ for (envp = environ; *envp; envp++)
+ puts (*envp);
+ exit (0);
+ }
+
+ /* printenv varname */
+ len = strlen (*argv);
+ for (envp = environ; *envp; envp++)
+ {
+ if (**argv == **envp && strncmp (*envp, *argv, len) == 0)
+ {
+ eval = *envp + len;
+ /* If the environment variable doesn't have an `=', ignore it. */
+ if (*eval == '=')
+ {
+ puts (eval + 1);
+ exit (0);
+ }
+ }
+ }
+ exit (1);
+}