Fix warnings.

Author: mjpt777

cppbuild/cppbuild

@@ -1,12 +1,12 @@
 #!/usr/bin/env bash
 
-SOURCE_DIR="`pwd`"
-BUILD_DIR="`pwd`/cppbuild/Release"
+SOURCE_DIR="$(pwd)"
+BUILD_DIR="$(pwd)/cppbuild/Release"
 
 ncpus=1
-case "`uname`" in
+case "$(uname)" in
   Darwin* )
-    ncpus=`sysctl -n hw.ncpu`
+    ncpus=$(sysctl -n hw.ncpu)
     ;;
   Linux*)
     ncpus=$(lscpu -p | egrep -v '^#' | wc -l)
@@ -17,9 +17,9 @@ echo "Will make with \"-j $ncpus\"."
 
 if [ -d "$BUILD_DIR" ] ; then
     echo "Build directory ($BUILD_DIR) exists, removing."
-    rm -rf $BUILD_DIR
+    rm -rf "$BUILD_DIR"
 fi
 
-mkdir -p $BUILD_DIR
+mkdir -p "$BUILD_DIR"
 
-(cd $BUILD_DIR && cmake -G "Unix Makefiles" $SOURCE_DIR && make clean && make -j "$ncpus" all && ctest -C Release --output-on-failure)
+(cd "$BUILD_DIR" && cmake -G "Unix Makefiles" "$SOURCE_DIR" && make clean && make -j "$ncpus" all && ctest -C Release --output-on-failure)