Replaced backticks with POSIX style commands.

build.sh

@@ -54,9 +54,9 @@ pushd build
 	echo OPENRCT2_CMAKE_OPTS = $OPENRCT2_CMAKE_OPTS
 	if [[ $TARGET == "docker32" ]]
 	then
-		PARENT=`readlink -f ../`
-		chmod a+rwx `pwd`
-		chmod g+s `pwd`
+		PARENT=$(readlink -f ../)
+		chmod a+rwx $(pwd)
+		chmod g+s $(pwd)
 		docker run -u travis -v $PARENT:/work/openrct2 -w /work/openrct2/build -i -t openrct2/openrct2:32bit-only bash -c "cmake ../ $OPENRCT2_CMAKE_OPTS && make"
 	else
 		cmake -DCMAKE_BUILD_TYPE=Debug $OPENRCT2_CMAKE_OPTS ..

install.sh

@@ -7,7 +7,7 @@ cachedir=.cache
 liburl=https://openrct.net/launcher/libs/orctlibs.zip
 mkdir -p $cachedir
 
-echo `uname`
+echo $(uname)
 
 # Sets default target to "linux", if none specified
 TARGET=${TARGET-linux}
@@ -104,7 +104,7 @@ function install_local_libs {
 
 echo TARGET = $TARGET
 
-if [[ `uname` == "Darwin" ]]; then
+if [[ $(uname) == "Darwin" ]]; then
     echo "Installation of OpenRCT2 assumes you have homebrew and use it to install packages."
 
     echo "Check if brew is installed"
@@ -162,7 +162,7 @@ if [[ `uname` == "Darwin" ]]; then
             popd
         popd
     fi
-elif [[ `uname` == "Linux" ]]; then
+elif [[ $(uname) == "Linux" ]]; then
 	if [[ -z "$TRAVIS" ]]; then
 	    sudo apt-get install -y binutils-mingw-w64-i686 gcc-mingw-w64-i686 g++-mingw-w64-i686 cmake
 		if [[ -z "$DISABLE_G2_BUILD" ]]; then
@@ -197,7 +197,7 @@ fi
 
 download_libs
 # mind the gap (trailing space)
-if [[ `uname` == "Darwin" ]]; then
+if [[ $(uname) == "Darwin" ]]; then
 	shasum -a 256 $cachedir/orctlibs.zip | cut -f1 -d\  > $libVFile
 else
 	sha256sum $cachedir/orctlibs.zip | cut -f1 -d\  > $libVFile