in reply to Re^3: How to access a hash from another file
in thread How to access a hash from another file

Thank you tospo.
The problem is that not each number can be combined with each evaluation name. Therefore I do need a config file. In fact I happened to populate the hash %module reading the csv-file in the following way:
open(my $fh, "<", "parameter.csv") or die "$!"; my $header = <$fh>; while(<$fh>) { my @line = split(/;/, $_); my $t = $line[0]; ${module}{$t}{name} = $line[1]; my $n = $line[2]; ${module}{$t}{indicator}{$n}{ind} = $line[3]; ${module}{$t}{indicator}{$n}{yscala} = $line[4]; } close $fh;
The file names in the gnuplot command are generated afterwards on the fly whereby only the names are created which are allowed by config file.
After that I used the code from wfsp from Re^2: How to declare variables per loop in the following way:
my @cmds; for my $number (sort keys %{${module}{$topic}{indicator}}){ my $cmd = build_command($number, %args); push @cmds, $cmd; } for (my $i=0; $i<@cmds; $i++) { if($i == 0 or $i % 2 == 0) { $cmds[$i] = "$multiplot\n\n$cmds[$i]"; } } for (my $i=0; $i<@cmds; $i++) { if($i % 2 == 1 or $i == $#cmds) { $cmds[$i] = "$cmds[$i]\n\n unset multiplot\n\n"; } } my $slurpline; for (my $i=0; $i<@cmds; $i++) { $slurpline.=$cmds[$i]; }

The gnuplot command itself is very short now:
open my $P, "|-", "gnuplot" or die; printflush $P qq[ $postscript $slurpline ]; close $P;

Thanks again!