/usr/lib/perl5/PDL/default.perldlrc is in pdl 1:2.007-2build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 | # default.perldlrc
# Default startup for perldl shell.
# Note: any $HOME/.perldlrc file overrides this
use PDL;
use PDL::Dbg;                 # Enable useful commands
use PDL::Constants qw(PI E);  # add PI and E constants
#use PDL::Lite; # Alternative to above for hard-core freaks
# These are some PDL::Core parameters that you may wish
# to set in an interactive PDL session:
#
#   $PDL::debug          When true, PDL debugging information is printed.
#   $PDL::verbose        When true, PDL functions provide chatty information.
#   $PDL::use_commas     Whether to insert commas when printing pdls
#   $PDL::floatformat    The default print format for floats
#   $PDL::doubleformat   The default print format for doubles
#   $PDL::undefval       The value to use instead of "undef" when creating pdls.
#   $PDL::toolongtoprint The maximal size pdls to print (defaults to 10000 elements)
# PDL waffle options (and pacify -w)
BEGIN{
   $PDL::debug = $PDL::debug = 0;
   $PDL::verbose = $PDL::verbose = 1;
   $PDL::toolongtoprint = $PDL::toolongtoprint = 10000;
   $PDL::IO::FlexRaw::writeflexhdr = 1;
}
if ( $PERLDL::TERM->ReadLine() =~ /::Perl$/ ) {
   if ( defined $readline::rl_MaxHistorySize ) {
      $readline::rl_MaxHistorySize = $PERLDL::HISTFILESIZE if defined $PERLDL::HISTFILESIZE;
   }
}
use PDL::Doc::Perldl; # online docs module
1;
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