wrap os name in quotes

.travis/after_success.sh

@@ -1,14 +1,17 @@
 #!/bin/bash
 
-if [[ $TRAVIS_OS_NAME == 'osx' ]]; then
+if [[ "$TRAVIS_OS_NAME" == "osx" ]]
+then
 	wget -c https://github.com/probonopd/uploadtool/raw/master/upload.sh
 	upload.sh Olive*.zip
-elif [[ $TRAVIS_OS_NAME == 'linux' ]]; then
+elif [[ "$TRAVIS_OS_NAME" == "linux" ]]
+then
 	find appdir -executable -type f -exec ldd {} \; | grep " => /usr" | cut -d " " -f 2-3 | sort | uniq
 	# curl --upload-file Olive*.AppImage https://transfer.sh/Olive-git.$(git rev-parse --short HEAD)-$ARCH.AppImage
 	wget -c https://github.com/probonopd/uploadtool/raw/master/upload.sh
 	# only create release for master
-	if [ "$TRAVIS_BRANCH" != "master" ]; then
+	if [ "$TRAVIS_BRANCH" != "master" ]
+	then
 		export TRAVIS_EVENT_TYPE=pull_request
 	fi
 	upload.sh Olive*.AppImage*

.travis/before_install.sh

@@ -1,8 +1,8 @@
 #!/bin/bash
 
-if [[ $TRAVIS_OS_NAME == 'osx' ]]; then
+if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then
 	# do nothing
-elif [[ $TRAVIS_OS_NAME == 'linux' ]]; then
+elif [[ "$TRAVIS_OS_NAME" == "linux" ]]; then
 	sudo add-apt-repository ppa:beineri/opt-qt593-trusty -y
 	sudo add-apt-repository ppa:jonathonf/ffmpeg-3 -y
 	sudo apt-get update -qq

.travis/install.sh

@@ -1,8 +1,8 @@
 #!/bin/bash
 
-if [[ $TRAVIS_OS_NAME == 'osx' ]]; then
+if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then
 	brew install ffmpeg qt5
-elif [[ $TRAVIS_OS_NAME == 'linux' ]]; then
+elif [[ "$TRAVIS_OS_NAME" == "linux" ]]; then
 	if [ "$ARCH" == "x86_64" ]; then sudo apt-get -y install qt59base qt59multimedia libavformat-dev libavcodec-dev libavfilter-dev libavutil-dev libswscale-dev libswresample-dev frei0r-plugins-dev frei0r-plugins fuse; fi
 	if [ "$ARCH" == "i386" ]; then sudo apt-get -y install gcc-multilib g++-multilib qt59base:i386 qt59multimedia:i386 libavformat-dev:i386 libavcodec-dev:i386 libavfilter-dev:i386 libavutil-dev:i386 libswscale-dev:i386 libswresample-dev:i386 frei0r-plugins-dev:i386 frei0r-plugins:i386 pkg-config:i386 libgl1-mesa-dev:i386 fuse:i386; fi
 	source /opt/qt*/bin/qt*-env.sh

.travis/script.sh

@@ -1,12 +1,12 @@
 #!/bin/bash
 
-if [[ $TRAVIS_OS_NAME == 'osx' ]]; then
+if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then
 	lrelease olive.pro
 	qmake CONFIG+=release PREFIX=/usr
 	make -j$(nproc)
 	macdeployqt Olive.app
 	zip -r Olive-$(git rev-parse --short HEAD)-macOS.zip Olive.app
-elif [[ $TRAVIS_OS_NAME == 'linux' ]]; then
+elif [[ "$TRAVIS_OS_NAME" == "linux" ]]; then
 	lrelease olive.pro
 	if [ "$ARCH" == "i386" ]; then
 		qmake CONFIG+=release "QMAKE_CFLAGS+=-m32" "QMAKE_CXXFLAGS+=-m32" "QMAKE_LFLAGS+=-m32" PREFIX=/usr -spec linux-g++-32; fi
@@ -24,7 +24,7 @@ elif [[ $TRAVIS_OS_NAME == 'linux' ]]; then
 		rm Olive*.AppImage
 		wget -c -nv "https://github.com/AppImage/AppImageKit/releases/download/continuous/appimagetool-i686.AppImage"
 		chmod a+x appimagetool-i686.AppImage
-		./appimagetool-i686.AppImage 'appdir' -n -g
+		./appimagetool-i686.AppImage "appdir" -n -g
 	fi
 fi