# try running this with bash, ksh, ash, and hush.
+
+# simple quoting rules.
+echo a b
+echo "a b"
+echo a "" b
+echo a '' b
+echo hello?
+echo "hello?"
+echo t* hello
+echo t\* hello
+
+# quick and painless exit for lash
+if false; then true; exit; fi
+
+# fairly simple command substitution
echo `echo -e foo\\\necho bar`
echo THIS IS A TEST >foo
if true || false; then echo foo; else echo bar5; fi
if true && false; then echo bar6; else echo foo; fi
-# ash, lash, and hush do not create fish; bash and ksh do. Tough.
-# Thanks to Tapani Tarvainen <tt@mit.jyu.fi> for this stress test.
+# basic distinction between local and env variables
+unset FOO
+FOO=bar env | grep FOO
+echo "but not here: $FOO"
+FOO=bar
+env | grep FOO
+echo "yes, here: $FOO"
+FOO=
+echo a $FOO b
+echo "a $FOO b"
+
+# not quite so basic variables. Credit to Matt Kraai.
+unset FOO
+FOO=bar
+export FOO
+env | grep FOO
+unset FOO
+export FOO=bar
+FOO=baz
+env | grep FOO
+
+# interaction between environment variables and if/then and subshells
+FOO=default
+if true; then FOO=new; fi
+echo $FOO
+FOO=default
+(FOO=bogus)
+echo $FOO
+
+# make sure we can duplicate file descriptors properly
+echo replacement >foo 2>&1
+cat foo
+cat doesnt_exist >foo 2>&1
+tr 'a-z' 'A-Z' <foo
+
+# fairly simple example of hush expanding variables too early
unset TMP
rm -f fish
-TMP=fish >$TMP
+TMP=fish && >$TMP
ls fish
+# ash, lash, and hush do not create wish; bash and ksh do.
+# Thanks to Tapani Tarvainen <tt@mit.jyu.fi> for this stress test.
+unset TMP
+rm -f wish
+TMP=wish >$TMP
+ls wish
+
# The following example shows that hush's parser is
# not _really_ Bourne compatible
echo "echo Hello World" >"a=b"
echo $a
# assuming the shell wasn't too buggy, clean up the mess
-rm -f a=b fish foo
+rm -f a=b wish fish foo