Hey, time to use my favourite trick: opening a pipe to a post-processor:
#!/bin/perl -w
use strict;
my $log= "logfile";
open( STDOUT, "| perl -p -e 'print q{[}, scalar localtime() , q{] };'
+>> $log" )
or die "cannot redirect output (open): $!";
print "Here he comes to save the day!\n";
# warning, if you don't have permission to write the file
# then the open will succeed but the close will fail,
# try it, it's quite surprising
close STDOUT or die "cannot redirect output (close): $!";
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