How to sort pstree and add pid

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I have a homework - I need to create a tree of processes using fork() and replace one of them with excelp(). Tree must be sorted (so only tree I created is visible, without other processes) and should display PID.



My result at below. However, I don't know how to sort a tree in a way, that only a.out and pstree processes were shown.
https://i.imgur.com/d9ECLBT.png



I used function execlp("pstree", "pstree", "-c", (char *)0);






linux ps fork pstree






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    up vote
    0
    down vote

    favorite












    I have a homework - I need to create a tree of processes using fork() and replace one of them with excelp(). Tree must be sorted (so only tree I created is visible, without other processes) and should display PID.



    My result at below. However, I don't know how to sort a tree in a way, that only a.out and pstree processes were shown.
    https://i.imgur.com/d9ECLBT.png



    I used function execlp("pstree", "pstree", "-c", (char *)0);






    linux ps fork pstree






    share







    New contributor




    Michał is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.





















      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      I have a homework - I need to create a tree of processes using fork() and replace one of them with excelp(). Tree must be sorted (so only tree I created is visible, without other processes) and should display PID.



      My result at below. However, I don't know how to sort a tree in a way, that only a.out and pstree processes were shown.
      https://i.imgur.com/d9ECLBT.png



      I used function execlp("pstree", "pstree", "-c", (char *)0);






      linux ps fork pstree






      share







      New contributor




      Michał is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      I have a homework - I need to create a tree of processes using fork() and replace one of them with excelp(). Tree must be sorted (so only tree I created is visible, without other processes) and should display PID.



      My result at below. However, I don't know how to sort a tree in a way, that only a.out and pstree processes were shown.
      https://i.imgur.com/d9ECLBT.png



      I used function execlp("pstree", "pstree", "-c", (char *)0);






      linux ps fork pstree




      linux ps fork pstree





      share







      New contributor




      Michał is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.










      share







      New contributor




      Michał is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.








      share



      share






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      Michał is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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      asked 7 mins ago









      Michał

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      Michał is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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      Michał is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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