diff --git a/packaging/make_release.sh b/packaging/make_release.sh
index 9ba37be872..02e8ff0753 100755
--- a/packaging/make_release.sh
+++ b/packaging/make_release.sh
@@ -12,23 +12,22 @@
 set -e  # exit on error
 
 # Sets the bash variables:
-# MRPT_VERSION_STR, MRPT_VER_MMP, MRPT_VER_MM, MRPT_VERSION_{MAJOR,MINOR,PATCH}
+# MRPT_VERSION_STR, MRPT_VER_MMP, MRPT_VERSION_{MAJOR,MINOR,PATCH}
 # --------------------------------
 if [ -f version_prefix.txt ];
 then
-	MRPT_VERSION_STR=`head -n 1 version_prefix.txt`
-    MRPT_VERSION_MAJOR=${MRPT_VERSION_STR:0:1}
+	MRPT_VERSION_STR=$(head -n 1 version_prefix.txt)
+	MRPT_VERSION_MAJOR=${MRPT_VERSION_STR:0:1}
 	MRPT_VERSION_MINOR=${MRPT_VERSION_STR:2:1}
 	MRPT_VERSION_PATCH=${MRPT_VERSION_STR:4:1}
-	MRPT_VER_MM="${MRPT_VERSION_MAJOR}.${MRPT_VERSION_MINOR}"
 	MRPT_VER_MMP="${MRPT_VERSION_MAJOR}.${MRPT_VERSION_MINOR}.${MRPT_VERSION_PATCH}"
-    echo "MRPT version: ${MRPT_VER_MMP}"
+	echo "MRPT version: ${MRPT_VER_MMP}"
 else
 	echo "Error: cannot find version_prefix.txt!! Invoke scripts from mrpt sources root directory."
 	exit 1
 fi
 
-MRPTSRC=`pwd`
+MRPTSRC=$(pwd)
 OUT_RELEASES_DIR="$HOME/mrpt_release"
 
 OUT_DIR=$OUT_RELEASES_DIR/mrpt-${MRPT_VERSION_STR}
@@ -40,74 +39,75 @@ echo "============================================================"
 echo
 
 # Prepare output directory:
-rm -fR $OUT_RELEASES_DIR  || true
-mkdir -p ${OUT_DIR}
+rm -fR "$OUT_RELEASES_DIR" || true
+mkdir -p "${OUT_DIR}"
 
 # Export / copy sources to target dir:
 if [ -d "$MRPTSRC/.git" ];
 then
 	echo "> Exporting git source tree to ${OUT_DIR}"
-	git archive --format=tar HEAD | tar -x -C ${OUT_DIR}
+	git archive --format=tar HEAD | tar -x -C "${OUT_DIR}"
 
 	# Include external submodules:
 	EXTERNAL_MODS="nanogui nanogui/ext/nanovg googletest libfyaml rplidar_sdk ${MRPT_PKG_EXPORTED_SUBMODULES}"
 	for MOD in $EXTERNAL_MODS;
 	do
 		echo "> Exporting git submodule: ${MRPTSRC}/3rdparty/$MOD"
-		cd ${MRPTSRC}/3rdparty/$MOD
-		git archive --format=tar HEAD | tar -x -C ${OUT_DIR}/3rdparty/$MOD
+		cd "${MRPTSRC}/3rdparty/$MOD"
+		git archive --format=tar HEAD | tar -x -C "${OUT_DIR}/3rdparty/$MOD"
 	done
 
-	cd ${MRPTSRC}
+	cd "${MRPTSRC}"
 
 	# Remove VCS control files:
-	find ${OUT_DIR} -name '.git*' | xargs rm -fr
+	find "${OUT_DIR}" -name '.git*' -delete
 
 	# Generate ./SOURCE_DATE_EPOCH with UNIX time_t
 	SOURCE_DATE_EPOCH=$(git log -1 --pretty=%ct)
 else
 	echo "> Copying sources to ${OUT_DIR}"
-	cp -R . ${OUT_DIR}
+	cp -R . "${OUT_DIR}"
 
 	# Generate ./SOURCE_DATE_EPOCH with UNIX time_t
 	SOURCE_DATE_EPOCH=$(date +%s)
 fi
 
 # See https://reproducible-builds.org/specs/source-date-epoch/
-echo $SOURCE_DATE_EPOCH > ${OUT_DIR}/SOURCE_DATE_EPOCH
+echo "$SOURCE_DATE_EPOCH" > "${OUT_DIR}/SOURCE_DATE_EPOCH"
 
 # Compile guides now:
-LST_GUIDES=`cat $MRPTSRC/doc/guide-list.txt`
+LST_GUIDES=$(cat "$MRPTSRC/doc/guide-list.txt")
 echo "> Building LaTeX documents..."
 for guide in $LST_GUIDES; do
 	echo ">  * Building $guide..."
-	make -C $MRPTSRC/doc/$guide/ > /tmp/mrpt_build_latex.log 2>&1
-	cp $MRPTSRC/doc/$guide/$guide.pdf ${OUT_DIR}/doc/
+	make -C "$MRPTSRC/doc/$guide/" > /tmp/mrpt_build_latex.log 2>&1
+	cp "$MRPTSRC/doc/$guide/$guide.pdf" "${OUT_DIR}/doc/"
 done
 
-cd ${OUT_DIR}
-
 # Orig tarball:
-cd ..
+cd "${OUT_DIR}/.."
+
 echo "> Creating source tarball: mrpt-${MRPT_VERSION_STR}.tar.gz"
-tar czf mrpt-${MRPT_VERSION_STR}.tar.gz mrpt-${MRPT_VERSION_STR}
+tar czf "mrpt-${MRPT_VERSION_STR}.tar.gz" "mrpt-${MRPT_VERSION_STR}"
 
 # Create .zip file with DOS line endings
 echo "> Creating source zip in DOS format: mrpt-${MRPT_VERSION_STR}.zip"
-cd mrpt-${MRPT_VERSION_STR}
+
+cd "${OUT_DIR}"
 bash scripts/all_files_change_format.sh todos
-cd ..
-zip mrpt-${MRPT_VERSION_STR}.zip -q -r mrpt-${MRPT_VERSION_STR}/*
 
-rm -fr mrpt-${MRPT_VERSION_STR}
+cd "${OUT_DIR}/.."
+zip "mrpt-${MRPT_VERSION_STR}.zip" -q -r "mrpt-${MRPT_VERSION_STR}/*"
+
+rm -fr "mrpt-${MRPT_VERSION_STR}"
 
 # GPG signature:
-gpg --armor --detach-sign mrpt-${MRPT_VERSION_STR}.tar.gz
+gpg --armor --detach-sign "mrpt-${MRPT_VERSION_STR}.tar.gz"
 
 
 echo "=================================================================="
 echo "                     Package files generated:"
 echo "=================================================================="
-find $(pwd)
+find "$(pwd)"
 echo "=================================================================="
 echo "You should also do now: \"git clean -fd\" in the source code root"
diff --git a/packaging/parse_mrpt_version.sh b/packaging/parse_mrpt_version.sh
index 68753539ad..8b3b1d8cf3 100644
--- a/packaging/parse_mrpt_version.sh
+++ b/packaging/parse_mrpt_version.sh
@@ -4,18 +4,17 @@
 
 if [ -f version_prefix.txt ];
 then
-	if [ -z ${MRPT_VERSION_STR+x} ];
+	if [ -z "${MRPT_VERSION_STR+x}" ];
 	then
 		# MRPT_VERSION_STR is not set by caller: load it
-		MRPT_VERSION_STR=`head -n 1 version_prefix.txt`
+		MRPT_VERSION_STR=$(head -n 1 version_prefix.txt)
 	fi
 
-    MRPT_VERSION_MAJOR=${MRPT_VERSION_STR:0:1}
+	MRPT_VERSION_MAJOR=${MRPT_VERSION_STR:0:1}
 	MRPT_VERSION_MINOR=${MRPT_VERSION_STR:2:1}
 	MRPT_VERSION_PATCH=${MRPT_VERSION_STR:4:1}
-	MRPT_VER_MM="${MRPT_VERSION_MAJOR}.${MRPT_VERSION_MINOR}"
 	MRPT_VER_MMP="${MRPT_VERSION_MAJOR}.${MRPT_VERSION_MINOR}.${MRPT_VERSION_PATCH}"
-    echo "MRPT version: ${MRPT_VER_MMP}"
+	echo "MRPT version: ${MRPT_VER_MMP}"
 else
 	echo "Error: cannot find version_prefix.txt!! Invoke scripts from mrpt sources root directory."
 	exit 1
diff --git a/packaging/ppa_build_and_upload_all.sh b/packaging/ppa_build_and_upload_all.sh
index 5ace1adc74..a876497fb6 100755
--- a/packaging/ppa_build_and_upload_all.sh
+++ b/packaging/ppa_build_and_upload_all.sh
@@ -9,18 +9,18 @@ set -e
 # Check:
 if [ -f version_prefix.txt ];
 then
-	MRPT_VERSION_STR=`head -n 1 version_prefix.txt`
+	MRPT_VERSION_STR=$(head -n 1 version_prefix.txt)
 	echo "MRPT version: ${MRPT_VERSION_STR}"
 else
 	echo "ERROR: Run this script from the MRPT root directory."
 	exit 1
 fi
 
-MRPTDIR=`pwd`
+MRPTDIR=$(pwd)
 
 # Build PPA packages:
 bash packaging/prepare_ubuntu_pkgs_for_ppa.sh
-cd $HOME/mrpt_ubuntu
+cd "$HOME/mrpt_ubuntu"
 
 # upload:
 find . -name '*.changes' | xargs -I FIL dput ppa:joseluisblancoc/mrpt FIL