When I login on a Fedora 31 workstation and run the ps command, I see the below output;
for an X session:
for a Wayland session:
As I understand, graphical logins via a display manager like gdm executes an X/Wayland session directly after authenticating a user, instead of executing a login shell. I see that both X and Wayland sessions are started on a virtual terminal (tty2), and what the Xorg(1) says about the vt option is: 'This option applies only to platforms that have virtual terminal support, such as Linux, BSD, OpenSolaris, SVR3, and SVR4.' Is starting X/Wayland sessions with a controlling tty done merely to provide the ability to switch to other virtual terminals while running a graphical shell in one, or is it a constraint of X/Wayland? Is it possible to start an X/Wayland session without a controlling tty on Linux, and is this up to gdm, X/Wayland, or systemd? And what would be an example of a system that runs Xorg and doesn't have virtual terminals at all unlike the systems listed in Xorg(1)?
How can I control the screen output when trying to read a large file onto the screen x number of lines at a time. I'm trying to use this is a bourne shell script. I want to display 10 lines of a file, pause the screen so that a user can read the file, and then display the next 10 lines of the file,... (6 Replies)
I want to display a system warning message at the prompt of every live terminal on a sun solaris 8 machine using CDE.
I know this can be done on a console, but what about dtterm and xterm regular windows?
Does anyone know how this is done?
What about a single terminal?
Clear skies,... (2 Replies)
hi all,
am trying to 'grep' some text from a log file and use the 'cut' command to read from that line i just grep'ed to extract date/time and response times.
code sniplet i am using is :
grep -i 'text to grep' Out.log |
while read LINE;
do
... (11 Replies)
Any one know the below means :
ps: no controlling terminal
I had run a script in background :
nohup ./benchmark.sh &
and shutdown my windows system from where i connected through SSH
I am using bash:
The above script perfoms various tasks of Benchmarking Repositories
Today the... (3 Replies)
I have created a ksh shell script and used it as a login shell for a user.
</etc/passwd>
lramirev:x:111:200:Luis:/export/home/menush:/usr/local/menush/menush
My shell script is like this:
</usr/local/menush/menush>
#!/bin/ksh
#
if ]
then
. $HOME/.profile
fi
... (8 Replies)
Hello all,
I would like a message to be displayed on the shell when someone opens up the terminal - something like a welcome msg with date and time. I know how to do this by running the shell commands but dont know how to display it when a user opens up the terminal?
Thanks in advance (27 Replies)
I have a .NET application that remotely starts, stops, and gets status of Windows services and scheduled tasks. I would like to add the capability of starting, stopping, and getting status of remote AIX applications also. Based on some preliminary research, one option may be to use 3rd party .NET... (0 Replies)
Hi all...
Consider me a dummy here...
I do not want any code or for anyone to show me how to do it at this time, but here is the question:-
I have had this brainstorm to be able to control the AudioScope.sh program in the "Shell Scripting And Programming" forum...
Is it possible, by... (4 Replies)
Why does removing "rhgb quiet" from the kernel boot parameters control whether or not the commands I enter are displayed in single user mode ?
For instance, if I do not remove "rhgb quiet", when I am in single user mode, whatever command I type will not be displayed on the screen.
The... (0 Replies)
Discussion started by: Hijanoqu
0 Replies
LEARN ABOUT CENTOS
tcgetpgrp
TCGETPGRP(3) Linux Programmer's Manual TCGETPGRP(3)NAME
tcgetpgrp, tcsetpgrp - get and set terminal foreground process group
SYNOPSIS
#include <unistd.h>
pid_t tcgetpgrp(int fd);
int tcsetpgrp(int fd, pid_t pgrp);
DESCRIPTION
The function tcgetpgrp() returns the process group ID of the foreground process group on the terminal associated to fd, which must be the
controlling terminal of the calling process.
The function tcsetpgrp() makes the process group with process group ID pgrp the foreground process group on the terminal associated to fd,
which must be the controlling terminal of the calling process, and still be associated with its session. Moreover, pgrp must be a
(nonempty) process group belonging to the same session as the calling process.
If tcsetpgrp() is called by a member of a background process group in its session, and the calling process is not blocking or ignoring
SIGTTOU, a SIGTTOU signal is sent to all members of this background process group.
RETURN VALUE
When fd refers to the controlling terminal of the calling process, the function tcgetpgrp() will return the foreground process group ID of
that terminal if there is one, and some value larger than 1 that is not presently a process group ID otherwise. When fd does not refer to
the controlling terminal of the calling process, -1 is returned, and errno is set appropriately.
When successful, tcsetpgrp() returns 0. Otherwise, it returns -1, and errno is set appropriately.
ERRORS
EBADF fd is not a valid file descriptor.
EINVAL pgrp has an unsupported value.
ENOTTY The calling process does not have a controlling terminal, or it has one but it is not described by fd, or, for tcsetpgrp(), this
controlling terminal is no longer associated with the session of the calling process.
EPERM pgrp has a supported value, but is not the process group ID of a process in the same session as the calling process.
CONFORMING TO
POSIX.1-2001.
NOTES
These functions are implemented via the TIOCGPGRP and TIOCSPGRP ioctls.
History
The ioctls appeared in 4.2BSD. The functions are POSIX inventions.
SEE ALSO setpgid(2), setsid(2), credentials(7)COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
GNU 2003-01-28 TCGETPGRP(3)