1setup_tmp=`mktemp -d -t setup` 2printenv | sort > "${setup_tmp}/orig" 3make print_exports | grep -E -v '^(MAKE|MFLAGS|SHLVL)' > "${setup_tmp}/exports" 4eval `comm -13 "${setup_tmp}/orig" "${setup_tmp}/exports" | sed 's,^\(.*\)$,export "\1",'` 5 6 7