src/config/lxrgmr-code/test/6.EnvVar.in

   1
   2 #
   3 # @ $!, $@, $#, $$, $*, $?
   4 # @ $()
   5 # @ ${}
   6 # # # count of.
   7 # # ! reference.
   8 # # : slice.
   9 # # / & // find & replace.
  10 # # # & ## & % & %% cut.
  11 # # - & :- & = & := & ? & :? & + & :+ init assignment.
  12 #
  13
  14
  15
  16
  17 $!
  18 $@
  19 $#
  20 $$
  21 $*
  22 $?
  23
  24 $(echo xxx)
  25
  26 ${var}
  27 ${var[0]}
  28 ${#var}
  29 ${#var[0]}
  30 ${!var}
  31 ${!var[0]}
  32 ${var:0:1}
  33 ${var[0]:0:1}
  34 ${var:-value}
  35 ${var:=value}
  36 ${var:？value}
  37 ${var:+value}
  38 ${var:-value}
  39 ${var:=value}
  40 ${var:？value}
  41 ${var:+value}
  42 ${var:+"str"}
  43 ${var:+'str'}
  44 ${var:+`cmd param`}
  45 ${var[0]:0:1}
  46 ${var[0]:0:1//test/#-/@()=_[]+:}
  47 ${var[0]:0:1/=_[/]}
  48 ${var[0]:0:1#*aaa}
  49 ${var[0]:0:1##*aaa}
  50 ${var[0]:0:1%*aaa}
  51 ${var[0]:0:1%%*aaa}
  52 ${var[0]:0:1^^}
  53 ${var[0]:0:1,,}