When I started with variables to print a variable $foo in a string
I used print ${foo}s but when I used print "$(foo)s"
it gave me
1000 4 24 27 30 46 108 125 1000)s . When I printed $( or $) it gives me the sequence 1000 4 24 27 30 46 108 125 1000 . Also
$[ gave 5.014002 and $] gave 0 . What do they mean?
$( = The real gid of this process.
$[ = This variable stores the index of the first element in an array, and of the first character in a substring. The default is 0.
$) = The effective gid of this process.
$] = Perlversion
seen here: http://perldoc.perl.org/perlvar.html
See perldoc perlvar (in fact, see it any time you have a question about $ followed by a symbol).
$( and $) give the real and effective gids of the process.
You get a space separated list of gids if the system supports membership in multiple groups simultaneously.
$[ is the index considered to be the first element of an array.
$] is an old way to get the version of Perl being used to run the program.
