You need to replace $system with a placeholder - it could be the word 'system' - and then, just before you print the header, use s/// to replace the placeholder with the value you want, which will be defined at that time.

my $header = "\n\n======= system =======\n";
...
sub change_password {
  my $system = shift;
  $header =~ s/system/$system/;
...

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Dum Spiro Spero

In reply to Re^3: expect.pm header by GotToBTru
in thread expect.pm header by amagana

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