perl File::tail log files.

user786 has asked for the wisdom of the Perl Monks concerning the following question:

I need to tail a log file as i run some commands on a cisco router. I used perl cpan File::Tail module.

my $file =  File::Tail->new("logs/nameoflogfile");

while(defined(my $line = $file->read))
{

   print "$line\n";
}
[download]

I get the following error : Error opening "filename" No such file or directory

Checked the following

1)File exists -->yes 2) Name of the file is correct, Path is correct.-->yes 3)I tried to tail a different file with the same script in my local host(not in router) it worked. 4)However on the router# it doesn't work. Any suggestions ?

Comment on perl File::tail log files. Download Code

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Re: perl File::tail log files. by aitap (Curate) on Jun 21, 2014 at 05:20 UTC
I need to tail a log file as i run some commands on a cisco router. Do you change directory anywhere in your script? Try inserting `use Cwd; print getcwd(), "/logs/nameoflogfile ", (-e getcwd()."/logs/nameoflogfile" ? "exists" : "does not exist"), "\n"` before the place where you open the file. I tried to tail a different file with the same script in my local host(not in router) it worked. Does this mean that you need to tail a log file on the remote host (CISCO router)? That could be a bit difficult.	[reply] [d/l]
Re: perl File::tail log files. by Anonymous Monk on Jun 21, 2014 at 08:53 UTC
However on the router# it doesn't work. What does "on the router" mean? In technical terms please	[reply]
Re^2: perl File::tail log files. by user786 (Sexton) on Jun 21, 2014 at 16:25 UTC
1) I ssh into a cisco router. 2)tail the log file 3) execute commands	[reply]
Re^3: perl File::tail log files. by parv (Parson) on Jun 21, 2014 at 23:29 UTC
See if File::SmartTail would help any. And I myself would rather use File::Tail::Multi than File::Tail for former supports filtering (besides being able to tail multiple files). Feb 15, 2019- cpan command "i /File::Tail::Multi/" does not find the module anymore. FWIW.	[reply]
Re: perl File::tail log files. by 1s44c (Scribe) on Jun 23, 2014 at 21:58 UTC
Use an absolute path for the file you are trying to tail? If that works you know it's a path issue.	[reply]