tests/exec6.sub

   1 # builtins with exit status inverted
   2
   3 ( true )
   4 echo $?
   5 ( ! true )
   6 echo $?
   7
   8 ( false )
   9 echo $?
  10 ( ! false )
  11 echo $?
  12
  13 # inverting shouldn't affect exit
  14 (exit 42)
  15 echo $?
  16
  17 ( ! exit 42 )
  18 echo $?
  19
  20 # commands requiring an exec with exit status inverted -- broken in bash-2.04
  21
  22 ( ls > /dev/null 2>&1 )
  23 echo $?
  24 ( ! ls > /dev/null 2>&1 )
  25 echo $?
  26
  27 touch /tmp/notwrite
  28 chmod 400 /tmp/notwrite
  29
  30 # make sure redirection failures in commands whose exit status is inverted
  31 # are handled correctly
  32
  33 ( ls > /tmp/notwrite ) 2>/dev/null
  34 echo $?
  35
  36 ( ! ls > /tmp/notwrite ) 2>/dev/null
  37 echo $?
  38
  39 # now add exit traps, true and false for commands with and without exit
  40 # status inversion
  41
  42 (trap 'false' 0 ; ! ls > /tmp/notwrite ) 2>/dev/null
  43 echo $?
  44
  45 (trap 'false' 0 ; ls > /tmp/notwrite ) 2>/dev/null
  46 echo $?
  47
  48 (trap 'true' 0 ; ! ls > /tmp/notwrite ) 2>/dev/null
  49 echo $?
  50
  51 (trap 'true' 0 ; ls > /tmp/notwrite ) 2>/dev/null
  52 echo $?
  53
  54 rm -f /tmp/notwrite