Find the answer to your Linux question:
Results 1 to 5 of 5
Hello, My name is Marcelo and I am a student in computer science facing a project that is getting difficult to implement. In order to solve some of my problems ...
Enjoy an ad free experience by logging in. Not a member yet? Register.
  1. #1
    Just Joined!
    Join Date
    Apr 2006
    Posts
    1

    Post [SOLVED] Last active tty


    Hello,

    My name is Marcelo and I am a student in computer science facing a project that is getting difficult to implement.

    In order to solve some of my problems I would like to get some information.

    I would like to know if it is possible in Linux to know from user space which is the last active tty attached to an user i choose(the last tty which had some activity in it). I will be root or some other user which will have the proper privileges. I am willing to do any combination of system calls and tricks.

    If it is not possible to do from user space then I would like to do it myself inside the kernel. I need to know where should I start reading to have the knowledge required to do the changes in the kernel (in my local copy of course).

    I have some knowledge of the kernel and some little experience in programming inside the kernel (mainly i played with the scheduler and the virtual memory).

    Thank you in advance,

    Marcelo Taube

  2. #2
    Linux User Krendoshazin's Avatar
    Join Date
    Feb 2005
    Location
    London, England
    Posts
    471
    This falls close to being a homework question, but I can give you a start and let you do the rest.
    This command will show the tty's and their access date and time, this is what will show you the last active tty, to grab the right user it's a simple grep.

    ls -lu /dev | grep tty | grep username

    You may find there are several tty's listed, as a user could be using quite a few tty's at that point, so you'll need to find a way to grep the latest out of the list.

  3. #3
    Just Joined!
    Join Date
    Sep 2009
    Location
    UK
    Posts
    2

    tty

    hi, i did what you suggested but go this error, can you advice please?

    [root@laptop ~]# ls -lu/dev |grep tty|grep root
    ls: invalid option -- '/'
    Try `ls --help' for more information.

    thanks in advance

    smithyd

  4. $spacer_open
    $spacer_close
  5. #4
    Super Moderator devils casper's Avatar
    Join Date
    Jun 2006
    Location
    Chandigarh, India
    Posts
    24,729
    There is a space between -lu and /dev
    Code:
    ls -lu /dev | grep tty | grep username
    It is amazing what you can accomplish if you do not care who gets the credit.
    New Users: Read This First

  6. #5
    Just Joined!
    Join Date
    Sep 2009
    Location
    UK
    Posts
    2

    tty

    Thanks devils casper, that worked fine..Cheers

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •