tests/varenv.sh

   1 #
   2 # varenv.sh
   3 #
   4 # Test the behavior of the shell with respect to variable and environment
   5 # assignments
   6 #
   7 expect()
   8 {
   9         echo expect "$@"
  10 }
  11
  12 a=1
  13 b=2
  14 c=3
  15 d=4
  16 e=5
  17 f=6 g=7 h=8
  18
  19 a=3 b=4 $CHMOD $MODE $FN
  20
  21 # This should echo "3 4" according to Posix.2
  22 expect "3 4"
  23 echo $a $b
  24
  25 set -k
  26
  27 # Assignment statements made when no words are left affect the shell's
  28 # environment
  29 a=5 b=6 $CHMOD c=7 $MODE d=8 $FN e=9
  30
  31 expect "5 6 7 8 9"
  32 echo $a $b $c $d $e
  33
  34 $CHMOD f=7 $MODE g=8 $FN h=9
  35 expect "7 8 9"
  36 echo $f $g $h
  37
  38 set +k
  39
  40 # The temporary environment does not affect variable expansion, only the
  41 # environment given to the command
  42
  43 export HOME=/usr/chet
  44 expect $HOME
  45 echo $HOME
  46
  47 expect $HOME
  48 HOME=/a/b/c /bin/echo $HOME
  49
  50 expect $HOME
  51 echo $HOME
  52
  53 # This should echo /a/b/c
  54 expect /a/b/c
  55 HOME=/a/b/c printenv HOME
  56
  57 set -k
  58
  59 # This should echo $HOME 9, NOT /a/b/c 9
  60
  61 expect "$HOME"
  62 HOME=/a/b/c /bin/echo $HOME c=9
  63 expect "$HOME 7"
  64 echo $HOME $c
  65
  66 # I claim the next two echo calls should give identical output.
  67 # ksh agrees, the System V.3 sh does not
  68
  69 expect "/a/b/c 9 /a/b/c"
  70 HOME=/a/b/c $ECHO a=$HOME c=9
  71 echo $HOME $c $a
  72
  73 expect "/a/b/c 9 /a/b/c"
  74 HOME=/a/b/c a=$HOME c=9
  75 echo $HOME $c $a
  76 set +k
  77
  78 # How do assignment statements affect subsequent assignments on the same
  79 # line?
  80 expect "/a/b/c /a/b/c"
  81 HOME=/a/b/c a=$HOME
  82 echo $HOME $a
  83
  84 # The system V.3 sh does this wrong; the last echo should output "1 1",
  85 # but the system V.3 sh has it output "2 2".  Posix.2 says the assignment
  86 # statements are processed left-to-right.  bash and ksh output the right
  87 # thing
  88 c=1
  89 d=2
  90 expect "1 2"
  91 echo $c $d
  92 d=$c c=$d
  93 expect "1 1"
  94 echo $c $d
  95
  96 # just for completeness
  97 unset d c
  98 expect unset
  99 echo ${d-unset}
 100
 101 # no output
 102 export a
 103 a=bcde
 104 export a
 105 /bin/true 2>/dev/null