Further to marto's reply:   As a basic introduction, see perlintro. Also see the articles in the Getting Started with Perl and Getting Deeper Into Perl sections of the monastery's Tutorials wing. My first thought would be something along the lines of

while (1) {

    while (process_is_still_going()) {
        sleep 30;
        }

    restart_the_process();

    }
[download]

Please try to come up with some code. The closer it is to something we can play with too, the better; see Short, Self-Contained, Correct Example. When you have some code about which you still have questions, please come back and we'll see if we can answer those questions.

Well, this isn't a code writing service. Show what you tried, how it failed and you'll likely get some help. How do I post a question effectively?, Tutorials, http://learn.perl.org.

You need to take a look at your process table (untested):

#!/usr/bin/env perl

use strict;
use warnings;
use Proc::ProcessTable;
use feature qw(say);

say grep {/emacs/i} 
    map { $_->cmndline } @{ Proc::ProcessTable->new->table };

__END__
[download]

See also Proc::ProcessTable and Better way to search in the process table?.

Regards, Karl