--- /dev/null
+:
+#
+# Test NTv2 (.gsb) support. Assumes ntv2_0.gsb is installed.
+#
+#
+NAD_DIR=`dirname $0`
+EXE=$1
+
+usage()
+{
+ echo "Usage: ${0} <path to 'cs2cs' program>"
+ echo
+ exit 1
+}
+
+if test -z "${EXE}"; then
+ EXE=../src/cs2cs
+fi
+
+if test ! -x ${EXE}; then
+ echo "*** ERROR: Can not find '${EXE}' program!"
+ exit 1
+fi
+
+echo "============================================"
+echo "Running ${0} using ${EXE}:"
+echo "============================================"
+
+OUT=ntv2_out
+#EXE=../src/cs2cs
+#
+echo "doing tests into file ${OUT}, please wait"
+rm -f ${OUT}
+#
+echo "##############################################################" >> ${OUT}
+echo Point in the ONwinsor subgrid. >> ${OUT}
+#
+$EXE +proj=latlong +ellps=clrk66 +nadgrids=ntv2_0.gsb \
+ +to +proj=latlong +datum=NAD83 -E -w4 >>${OUT} <<EOF
+82d00'00.000"W 42d00'00.000"N 0.0
+82d00'01.000"W 42d00'00.000"N 0.0
+82d00'02.000"W 42d00'00.000"N 0.0
+84d00'00.000"W 42d00'00.000"N 0.0
+EOF
+
+echo "##############################################################" >> ${OUT}
+echo Try with NTv2 and NTv1 together ... falls back to NTv1 >> ${OUT}
+#
+$EXE +proj=latlong +ellps=clrk66 +nadgrids=ntv2_0.gsb,ntv1_can.dat,conus \
+ +to +proj=latlong +datum=NAD83 -E -w4 >>${OUT} <<EOF
+99d00'00.000"W 65d00'00.000"N 0.0
+111d00'00.000"W 46d00'00.000"N 0.0
+111d00'00.000"W 47d30'00.000"N 0.0
+EOF
+#
+##############################################################################
+# Done!
+# do 'diff' with distribution results
+echo "diff ${OUT} with ${OUT}.dist"
+diff -b ${OUT} ${NAD_DIR}/${OUT}.dist
+if [ $? -ne 0 ] ; then
+ echo ""
+ echo "PROBLEMS HAVE OCCURED"
+ echo "test file ${OUT} saved"
+ echo
+ exit 100
+else
+ echo "TEST OK"
+ echo "test file ${OUT} removed"
+ echo
+ /bin/rm -f ${OUT}
+ exit 0
+fi
+