tests/exec6.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 # builtins with exit status inverted
  15
  16 ( true )
  17 echo $?
  18 ( ! true )
  19 echo $?
  20
  21 ( false )
  22 echo $?
  23 ( ! false )
  24 echo $?
  25
  26 # inverting shouldn't affect exit
  27 (exit 42)
  28 echo $?
  29
  30 ( ! exit 42 )
  31 echo $?
  32
  33 # commands requiring an exec with exit status inverted -- broken in bash-2.04
  34
  35 ( ls > /dev/null 2>&1 )
  36 echo $?
  37 ( ! ls > /dev/null 2>&1 )
  38 echo $?
  39
  40 touch /tmp/notwrite
  41 chmod 400 /tmp/notwrite
  42
  43 # make sure redirection failures in commands whose exit status is inverted
  44 # are handled correctly
  45
  46 ( ls > /tmp/notwrite ) 2>/dev/null
  47 echo $?
  48
  49 ( ! ls > /tmp/notwrite ) 2>/dev/null
  50 echo $?
  51
  52 # now add exit traps, true and false for commands with and without exit
  53 # status inversion
  54
  55 (trap 'false' 0 ; ! ls > /tmp/notwrite ) 2>/dev/null
  56 echo $?
  57
  58 (trap 'false' 0 ; ls > /tmp/notwrite ) 2>/dev/null
  59 echo $?
  60
  61 (trap 'true' 0 ; ! ls > /tmp/notwrite ) 2>/dev/null
  62 echo $?
  63
  64 (trap 'true' 0 ; ls > /tmp/notwrite ) 2>/dev/null
  65 echo $?
  66
  67 rm -f /tmp/notwrite