A Portable Bash Function to List Process Hierarchies

parents.sh

parents(){ :(){                                                                                                                       
          read p n <<<`ps -o ppid,comm -p $1 | awk 'NR>1{print $1,$2}'`;
          echo -e "$1\t$n";
          test $1 -ne 0 && : $p; };
      : $1; }