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my $syslog_file = "tail -n 0 -f /var/log/messages | "; 
print STDOUT "some debug line: $syslog_file\n";
open(FH,"syslog_file")
print STDOUT "didn't reach before\n";

my $syslog_file = "tail -n 0 -f /var/log/messages | "; 
print STDERR "some debug line: $syslog_file\n";
open(FH,"syslog_file")
print STDERR "reaches now\n";