After looking at exec's documentation I noticed a more general way to do this. You call sh, lying to it about its name. Here is a slightly more general function, does the same thing as above but does not assume you are running bash as your default shell: 
sub get_login_env {
  local %ENV;
  my $shell = shift || (getpwuid($<))[8];
  my $env = `echo env | perl -e 'exec {"$shell"} -sh'`;
  if (wantarray) {
    $env =~ s/\\(.)/$1/gs;
    return map {split /=/, $_, 2} map {split /\n/, $_} $env;
  }
  else {
    return $env;
  }
}

[download]
And since someone asked, the reason for localizing %ENV was to clear the environment before calling the login shell. I may trust the login environment to have a sane environment, but I won't trust my current environment to be clean! :-)

This should work on virtually any *nix with virtually any valid shell, and you can choose the shell to be an argument or take the current shell you use (your choice).

Update: (Much later.) Hue-Bond pointed out that the missing | in the grandchild is missing here as well. Fixed.

In reply to RE (tilly) 1: Get default login environment by tilly
in thread Get default login environment by tilly

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