tests/nameref3.sub

   1 #   This program is free software: you can redistribute it and/or modify
   2 #   it under the terms of the GNU General Public License as published by
   3 #   the Free Software Foundation, either version 3 of the License, or
   4 #   (at your option) any later version.
   5 #
   6 #   This program is distributed in the hope that it will be useful,
   7 #   but WITHOUT ANY WARRANTY; without even the implied warranty of
   8 #   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   9 #   GNU General Public License for more details.
  10 #
  11 #   You should have received a copy of the GNU General Public License
  12 #   along with this program.  If not, see <http://www.gnu.org/licenses/>.
  13 #
  14 # nameref requires changes to unset
  15 bar=one
  16 typeset -n foo=bar
  17
  18 # normal unset unsets only variable nameref references
  19 # need unset -n to unset nameref itself
  20 unset foo
  21 echo "expect <unset>"
  22 recho ${bar-unset}
  23 echo "expect <unset>"
  24 recho ${foo-unset}
  25 echo "expect <bar>"
  26 recho ${!foo}
  27 unset -n foo
  28 echo "expect <unset>"
  29 recho "${!foo-unset}"
  30
  31 readonly bar=two
  32 typeset -n foo=bar
  33
  34 unset foo       # this should fail because bar is readonly
  35
  36 echo "expect <two>"
  37 echo ${bar-unset}
  38 echo "expect <two>"
  39 echo ${foo-unset}
  40
  41 # one question is what happens when you unset the underlying variable
  42 qux=three
  43 typeset -n ref
  44 ref=qux
  45
  46 echo $ref
  47 unset qux
  48 echo ${ref-unset}
  49 qux=four
  50 echo ${ref-unset}