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$ ps -ef | awk '{ print $1,$2,$8 }' | grep '^kdfadm '
$ ps -ef | awk '{ if ($1 == "kdfadm") print $1,$2,$8 }'

use strict;
use warnings;
...
}
close $cmd;

use strict;
use warnings;
...
    print @{ $p }{qw( uid pid cmndline )} if ($p->uid == $uid);
}