Ubuntu – How many tty and pts are running on the pc

guitty

I found that more pts can be created this way.

To reboot into text mode-tty1
to input startx to jump into gui mode.
To enter terminal in the gui mode started from tty1 to inupt.
```
  tty    
  /dev/pts/0  
```

this gui is pts/0

to input ctrl+alt+f2 to jump into
another text mode-tty2
to input startx to jump into gui mode, this gui is pts/1.

To enter terminal in the gui mode started from tty2 to inupt

    tty
    /dev/pts/1

Now two gui modes can be created.
How to know how many tty and pts are running at the same time on my pc?

Every gui program–include virtual terminal in gui is the client(or say slave) of x-server(or say x window system) ,so it was called pesudo terminal slave.

Muru give me many new knowledge,maybe there is a wrong expression in muru's explaination.

In my opinion,the proper sentence would be that:
but that's an application program in X server started from the tty1, but also a pts.

Please see the discuss here on what is pts/0 and (:0.0) in linux when typing who am i

From the knowledge,i draw my conclusion.

It not only an X server started from the tty1, but also a pts.

Best Answer

this gui is pts/0

Um, nope. I'm not sure where you got pts/0 from, but that's an X server started from the tty1, it isn't pts/0. See this U&L post for more.

At any given time, by default, there are 6 TTYs with getty running on them (so that you can login there) - TTYs 1-6, which you can access using CtrlAltF1-F6. TTY 7 has the GUI started by default. On 16.04 and above, you can start more getty instances using:

systemctl start getty@ttyN

Replacing N with an appropriate number.

To find the number of pseudoterminals currently open, you can do:

ps -eo tty= | sort -u

ps -e lists all processes, and -o tty= lists the process TTYs without a header line. sort and get unique entries with -u. For example:

$ ps -eo tty= | sort -u
?
pts/0
pts/1
pts/2
tty1
ttyS0

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Ubuntu – Can’t view output in tty. (Ctrl+alt+f1 to f6 don’t work, and display a black screen).

OK, I found a fix for myself, and I am leaving it here in case other people with the same problem find this. First run sudo apt-get install v86d Then run cat /sys/bus/platform/drivers/uvesafb/uvesafb.0/vbe_modes, and remember the highest of the modes it outputs. (If this doesn't output anything you may need to restart your computer after installing v86d, I can't quite remember). Then run gksudo gedit /etc/default/grub, and make the grub_cmdline_linux_default look like this: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset video=uvesafb:mode_option=1024x768-32,mtrr=3,scroll=ywrap", also check if this file contains the GRUB_GFXPAYLOAD_LINUX=something or other line. If it does, then remove it. But replace 1024x768-32 with the highest listed resolution from the second step. Then run gksudo gedit /etc/initramfs-tools/modules, and add this to the bottom: uvesafb mode_option=1024x768-32 mtrr=3 scroll=ywrap Once again replacing 1024x768-32 with the mode you found. Then run gksudo gedit /etc/grub.d/10_linux, and find the part which looks like this:

function gfxmode {
    set gfxpayload="${1}"
    if [ "${1}" = "keep" ]; then
        set vt_handoff=7
    else
        set vt_handoff=
    fi
}

and make it look like this:

function gfxmode {
    set gfxpayload="${1}"
    if [ "${1}" = "keep" ]; then
        set vt_handoff=
    else
        set vt_handoff=
    fi
}

Then run sudo update-grub; sudo update-initramfs -u. Reboot and the problem will be fixed :)

Ubuntu – How to access a console TTY on a MacBook

Seems like I needed Fn Ctrl-Opt-F3

Best Answer

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Ubuntu – Can’t view output in tty. (Ctrl+alt+f1 to f6 don’t work, and display a black screen).

Ubuntu – How to access a console TTY on a MacBook

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