Script cleanup

bin/darwin-env.sh

@@ -1,8 +1,22 @@
 #!/bin/sh
 
-env > ${TMPDIR}/env-pre
-. ${HOME}/.shenv
-env > ${TMPDIR}/env-post
-for VAR in $(env | cut -d'=' -f1) ; do
-  /bin/launchctl setenv "${VAR}" "$(eval echo \$${VAR})"
-done
+set -o nounset
+
+TMP_DIR="${TMPDIR:-/tmp}"
+TMP_DIR="${TMP_DIR%/}"
+
+env > "${TMP_DIR}/env-pre" 2>/dev/null || true
+if [ -f "${HOME}/.shenv" ]; then
+  . "${HOME}/.shenv"
+fi
+env > "${TMP_DIR}/env-post" 2>/dev/null || true
+
+if [ -x "/bin/launchctl" ]; then
+  for VAR in $(env | awk -F= '/^[a-zA-Z_][a-zA-Z0-9_]*=/ {print $1}') ; do
+    case "${VAR}" in
+      _|""|*[!a-zA-Z0-9_]*|[0-9]*) continue ;;
+    esac
+    eval "val=\${${VAR}:-}"
+    /bin/launchctl setenv "${VAR}" "${val}"
+  done
+fi