diff --git a/Installer/pkgPostInstall.sh b/Installer/pkgPostInstall.sh
index babb41e8..529f53f7 100644
--- a/Installer/pkgPostInstall.sh
+++ b/Installer/pkgPostInstall.sh
@@ -1,18 +1,20 @@
 #!/bin/sh
-loggedInUser=$(stat -f%Su /dev/console)
+
+TARGET='vChewing'
+login_user=`/usr/bin/stat -f%Su /dev/console`
 
 # First, copy the wrongfully installed contents to the right location:
-cp -r /Library/Input\ Methods/vChewing.app /Users/$(stat -f%Su /dev/console)/Library/Input\ Methods/ || true
-cp -r /Library/Keyboard\ Layouts/vChewing* /Users/$(stat -f%Su /dev/console)/Library/Keyboard\ Layouts/ || true
-chown "$loggedInUser" /Users/$(stat -f%Su /dev/console)/Library/Input\ Methods/vChewing.app || true
-chown "$loggedInUser" /Users/$(stat -f%Su /dev/console)/Library/Keyboard\ Layouts/vChewing* || true
+cp -r /Library/Input\ Methods/"${TARGET}".app /Users/"${login_user}"/Library/Input\ Methods/ || true
+cp -r /Library/Keyboard\ Layouts/"${TARGET}"* /Users/"${login_user}"/Library/Keyboard\ Layouts/ || true
+chown "${login_user}" /Users/"${login_user}"/Library/Input\ Methods/"${TARGET}".app || true
+chown "${login_user}" /Users/"${login_user}"/Library/Keyboard\ Layouts/"${TARGET}"* || true
 
 sleep 1
 
 # Second, clean the wrongfully installed contents:
-rm -rf /Library/Input\ Methods/vChewing.app || true
-rm -rf /Library/Keyboard\ Layouts/vChewing* || true
+rm -rf /Library/Input\ Methods/"${TARGET}".app || true
+rm -rf /Library/Keyboard\ Layouts/"${TARGET}"* || true
 sleep 1
 
 # Finally, register the input method:
-/Users/$(stat -f%Su /dev/console)/Library/Input\ Methods/vChewing.app/Contents/MacOS/vChewing install --all || true
+/Users/"${login_user}"/Library/Input\ Methods/"${TARGET}".app/Contents/MacOS/"${TARGET}" install --all || true
diff --git a/Installer/pkgPreInstall.sh b/Installer/pkgPreInstall.sh
index fc3cb9a6..72c22905 100644
--- a/Installer/pkgPreInstall.sh
+++ b/Installer/pkgPreInstall.sh
@@ -1,9 +1,8 @@
 #!/bin/sh
-loggedInUser=$(stat -f%Su /dev/console)
 
 killall vChewing || true
 
-if [ "$loggedInUser" = root ]; then
+if [ "${login_user}" = root ]; then
     rm -rf /Library/Input\ Methods/vChewing.app || true
     rm -rf /Library/Keyboard\ Layouts/vChewingKeyLayout.bundle || true
     rm -rf /Library/Keyboard\ Layouts/vChewing\ Dachen.keylayout || true