tests/nameref16.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 # post-bash-4.3 changes for more ksh93 compatibility when following nameref
  15 # chains and using typeset/declare -n to operate on nameref variables rather
  16 # than the variables they reference
  17
  18 # don't follow nameref chain when using declare -n and at the global scope
  19 unset -n r1 r2
  20
  21 typeset -n r1=r2
  22 typeset -n r2=x
  23 typeset -n r1=y
  24
  25 typeset -p r1 r2 x y
  26
  27 # same behavior when in a shell function
  28 foo()
  29 {
  30         typeset -n r1=r2
  31         typeset -n r2=x
  32         typeset -n r1=y
  33
  34         typeset -p r1 r2 x y
  35 }
  36 unset -n r1 r2
  37 foo
  38 unset -f foo
  39
  40 # same behavior when namerefs aren't chained
  41 unset -n r1 r2
  42
  43 typeset -n r1=z
  44 typeset -n r2=x
  45 typeset -n r1=y
  46 typeset -p r1 r2 x y
  47
  48 # same behavior when referenced variables have values
  49 unset -n r1 r2
  50
  51 x=one
  52 y=two
  53 typeset -n r1=r2
  54 typeset -n r2=x
  55 typeset -n r1=y
  56
  57 typeset -p r1 r2 x y