Variables in quotes

scripts/build.sh

@@ -4,7 +4,7 @@
 necessary_packages=("pdflatex")
 
 for package in ${necessary_packages}; do
-    if ! [dpkg -l ${package} > /dev/null 2>&1]; then
+    if ! [dpkg -l "${package}" > /dev/null 2>&1]; then
         echo "Error: ${package} is not installed."
         exit 1
     fi
@@ -16,8 +16,8 @@ subdirectory_file_name=main
 for D in *; do
     if [ -d "${D}" ]; then
         echo "Building ${D}..."
-        cd ${D}
-        pdflatex -interaction=nonstopmode -halt-on-error ${subdirectory_file_name}.tex
+        cd "${D}"
+        pdflatex -interaction=nonstopmode -halt-on-error "${subdirectory_file_name}.tex"
         cd ..
     fi
 done
@@ -26,7 +26,7 @@ done
 main_file_name=main_text
 
 echo "Building main PDF..."
-pdflatex -interaction=nonstopmode -halt-on-error ${main_file_name}.tex
+pdflatex -interaction=nonstopmode -halt-on-error "${main_file_name}.tex"
 
 # Clean up
 rm -rf *.aux *.log *.out *.toc