Add new commands to mysqltest - to make it easier to write portable test scripts

client/Makefile.am:
  Link mysqltest with mysys library
client/mysqltest.c:
  Add new commands to mysqltest:
   - remove_file
   - copy_file
   - file_exists
   - write_file
   - perl
mysql-test/r/mysqltest.result:
  Update result file
mysql-test/t/mysqltest.test:
  Add tests for new commands

client/Makefile.am

@@ -46,7 +46,8 @@ mysqladmin_SOURCES =		mysqladmin.cc
 mysql_LDADD =			@readline_link@ @TERMCAP_LIB@ $(LDADD) $(CXXLDFLAGS)
 mysqltest_SOURCES=		mysqltest.c $(top_srcdir)/mysys/my_getsystime.c \
 				$(yassl_dummy_link_fix)
-mysqltest_LDADD =		$(top_builddir)/regex/libregex.a $(LDADD)
+mysqltest_LDADD =		$(top_builddir)/regex/libregex.a $(LDADD) \
+				$(top_builddir)/mysys/libmysys.a
 mysqlbinlog_SOURCES =		mysqlbinlog.cc $(top_srcdir)/mysys/mf_tempdir.c \
 				$(top_srcdir)/mysys/my_new.cc \
 				$(top_srcdir)/mysys/my_bit.c \

mysql-test/r/mysqltest.result

@@ -467,3 +467,14 @@ a	D
 1	1
 1	4
 drop table t1;
+mysqltest: At line 1: Missing required argument 'filename' to command 'remove_file'
+mysqltest: At line 1: Missing required argument 'filename' to command 'write_file'
+mysqltest: At line 1: End of file encountered before 'EOF' delimiter was found
+mysqltest: At line 1: End of line junk detected: "write_file filename ";
+"
+mysqltest: At line 1: Missing required argument 'filename' to command 'file_exists'
+mysqltest: At line 1: Missing required argument 'from_file' to command 'copy_file'
+mysqltest: At line 1: Missing required argument 'to_file' to command 'copy_file'
+hello
+hello
+hello

mysql-test/t/mysqltest.test

@@ -1159,3 +1159,78 @@ insert into t1 values (2,4);
 --replace_regex /A/C/ /B/D/i /3/2/ /2/1/
 select * from t1;
 drop table t1;
+
+# ----------------------------------------------------------------------------
+# test for remove_file
+# ----------------------------------------------------------------------------
+
+--error 1
+--exec echo "remove_file ;" | $MYSQL_TEST 2>&1
+
+--error 1
+remove_file non_existing_file;
+
+# ----------------------------------------------------------------------------
+# test for write_file
+# ----------------------------------------------------------------------------
+--error 1
+--exec echo "write_file ;" | $MYSQL_TEST 2>&1
+
+--error 1
+--exec echo "write_file filename ;" | $MYSQL_TEST 2>&1
+
+--error 1
+--exec echo "write_file filename \";" | $MYSQL_TEST 2>&1
+
+# ----------------------------------------------------------------------------
+# test for file_exist
+# ----------------------------------------------------------------------------
+--error 1
+--exec echo "file_exists ;" | $MYSQL_TEST 2>&1
+
+--error 0,1
+remove_file $MYSQLTEST_VARDIR/tmp/test_file1.tmp;
+--error 1
+file_exists $MYSQLTEST_VARDIR/tmp/test_file1.tmp;
+write_file $MYSQLTEST_VARDIR/tmp/test_file1.tmp;
+Content for test_file1
+EOF
+file_exists $MYSQLTEST_VARDIR/tmp/test_file1.tmp;
+remove_file $MYSQLTEST_VARDIR/tmp/test_file1.tmp;
+--error 1
+file_exists $MYSQLTEST_VARDIR/tmp/test_file1.tmp;
+
+
+# ----------------------------------------------------------------------------
+# test for copy_file
+# ----------------------------------------------------------------------------
+--write_file $MYSQLTEST_VARDIR/tmp/file1.tmp
+file1
+EOF
+
+copy_file $MYSQLTEST_VARDIR/tmp/file1.tmp $MYSQLTEST_VARDIR/tmp/file2.tmp;
+file_exists $MYSQLTEST_VARDIR/tmp/file2.tmp;
+remove_file $MYSQLTEST_VARDIR/tmp/file1.tmp;
+remove_file $MYSQLTEST_VARDIR/tmp/file2.tmp;
+
+--error 1
+--exec echo "copy_file ;" | $MYSQL_TEST 2>&1
+
+--error 1
+--exec echo "copy_file from_file;" | $MYSQL_TEST 2>&1
+
+# ----------------------------------------------------------------------------
+# test for perl
+# ----------------------------------------------------------------------------
+--perl
+print "hello\n";
+EOF
+
+perl;
+print "hello\n";
+EOF
+
+perl;
+  # Print "hello"
+  print "hello\n";
+EOF