Add double quotes where immediately possible.

tests/build/header-sanity/test.sh

@@ -1,13 +1,13 @@
-#!/bin/sh
+#!/bin/bash
 set -xe 
 CPPFLAGS=$(pkg-config --silence-errors --cflags libtirpc)
-for i in $HEADERS/*.h; do
+for i in "$HEADERS"/*.h; do
     case $i in
     */rtapi_app.h) continue ;;
     esac
-    gcc ${CPPFLAGS} -DULAPI -I$HEADERS -E -x c $i > /dev/null
+    gcc ${CPPFLAGS} -DULAPI -I"$HEADERS" -E -x c "$i" > /dev/null
 done
-for i in $HEADERS/*.h $HEADERS/*.hh; do
+for i in "$HEADERS"/*.h "$HEADERS"/*.hh; do
     case $i in
     */rtapi_app.h) continue ;;
     */interp_internal.hh) continue ;;
@@ -17,5 +17,5 @@ for i in $HEADERS/*.h $HEADERS/*.hh; do
     else
         ELEVEN=-std=c++0x
     fi
-    g++ ${CPPFLAGS} $ELEVEN -DULAPI -I$HEADERS -E -x c++ $i > /dev/null
+    g++ ${CPPFLAGS} "$ELEVEN" -DULAPI -I"$HEADERS" -E -x c++ "$i" > /dev/null
 done

tests/build/ui/test.sh

@@ -1,6 +1,6 @@
 #!/bin/sh
 set -x
-g++ -I${HEADERS} \
+g++ -I"${HEADERS}" \
     nml-position-logger.cc \
     -L "${LIBDIR}" -lnml -llinuxcnc \
     -o /dev/null

tests/interp/compile/test.sh

@@ -3,5 +3,5 @@ set -xe
 
 g++ -o use-rs274 use-rs274.cc \
     -Wall -Wextra -Wno-return-type -Wno-unused-parameter \
-    -I $HEADERS $PYTHON_CPPFLAGS -L "$LIBDIR" -Wl,-rpath,$LIBDIR $PYTHON_EXTRA_LDFLAGS $PYTHON_LIBS $PYTHON_EXTRA_LIBS -lrs274
+    -I "$HEADERS" $PYTHON_CPPFLAGS -L "$LIBDIR" -Wl,-rpath,"$LIBDIR" $PYTHON_EXTRA_LDFLAGS $PYTHON_LIBS $PYTHON_EXTRA_LIBS -lrs274
 LD_BIND_NOW=YesPlease ./use-rs274

tests/lowlevel/mutex/test.sh

@@ -1,5 +1,5 @@
 #!/bin/sh
-gcc -O -I${HEADERS} test.c -o test -DULAPI -std=gnu99 -pthread || exit 1
+gcc -O -I"${HEADERS}" test.c -o test -DULAPI -std=gnu99 -pthread || exit 1
 ./test; exitval=$?
 rm -f test
 exit $exitval

tests/rtapi_printf.0/test.sh

@@ -1,6 +1,6 @@
 #!/bin/bash -xe
 
-g++ -DULAPI -I${HEADERS} -std=c++0x -I${HEADERS} \
-    -DSIM -rdynamic -L${LIBDIR} \
+g++ -DULAPI -I"${HEADERS}" -std=c++0x \
+    -DSIM -rdynamic -L"${LIBDIR}" \
     -o test_rtapi_vsnprintf test_rtapi_vsnprintf.c
 ./test_rtapi_vsnprintf