There is a nice lib for Perl for working with processes in Linux. And it could be used to get PIDs of processes that have been working more than some amount of time.
#!/usr/bin/perl -w
use strict;
use Proc::ProcessTable;
my $period = time-(2*60*60);
# in this case it's two hours
my $t = new Proc::ProcessTable;
foreach my $p ( @{$t->table} ) {
if ( ($p->start() < $period) and ($p->cmndline() =~ /your_process_name/) ) {
print $p->pid, "n";
}
}
Now you can use simple wrapper to kill them gracefully.
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