Is the file "/opt/btb_webservice/ver3/lease_list.txt" writable ?

Mixing shell and perl without error checking is error prone.

I'd recommend using the perl module File::Inplace to replace your "sed" call, using something like (untested): 

use File::Inplace;
 
my $editor = File::Inplace::->new(
    file => "/opt/btb_webservice/ver3/lease_list.txt");
while (my ($line) = $editor->next_line) {
   $line =~/$client_mac/ or next;
   $editor->replace_line(""); # Zap line
}
$editor->commit;

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In reply to Re: tail script by NetWallah
in thread tail script by leostereo

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