Dear Shmem, I like that. It is simple. Thanks.

#!/usr/bin/perl -w
use strict;
my $agent = "best1agent_start";
my $bgs=<<HERE;
'bgs')
  /usr/bin/su - patrol /usr/adm/best1_default/bgs/scripts/best1collect
 -q>>\$LOG 2>>\$LOG
  ;;
HERE
my $collect = "    /usr/bin/su - patrol
 /usr/adm/best1_default/bgs/scripts/best1collect -q>>\$LOG 2>>\$LOG\n"
+;
my $cf_dir = "/root/sysedge/cf_files";
#my $cf_dir = "/export/home/f358118/sysedge";
open SH_FILES, "sys.sh" or die "Error: $!";
my @sh_f=<SH_FILES>;
close SH_FILES;
foreach my $sh (@sh_f) {
    local $/ = ''; # slurp mode
    open IN, '<', $sh    # really? or is it "$cf_dir/$sh" ?
        or die "Can't open '$sh' for input: $!\n";
    open OUT, '>', "$cf_dir/$sh.tmp"
        or die "Can't write '$cf_dir/$sh.tmp': $!\n";

    $_ = <IN>;

    s/^\s*'bgs'\).*?;;//msg;
    s/^(\s*'syslogd'\).*?;;/$1\n$bgs/ms;

    print OUT;

    close OUT or die "Can't close filehandle OUT properly: $!\n";
    rename "$cf_dir/$sh.tmp", $sh; # if appropriate
}
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