Linux Small Knowledge Terminal

(1) Linux default a total of 6 virtual terminals, these 6 dummy terminal memory, the user use, when the process hangs, you can use ALT+FN (n corresponding to 1-6) key combination switch Another terminal, find the process number to kill the process, such as, You can see that there are 6 virtual terminals.

[[email protected]~] #ps aux | grep TTY
Root 2419 0.0 0.0 4064 532 tty4 ss+ Jun17 0:00/sbin/mingetty/dev/tty4
Root 2421 0.0 0.0 4064 536 tty5 ss+ Jun17 0:00/sbin/mingetty/dev/tty5
Root 2423 0.0 0.0 4064 532 tty6 ss+ Jun17 0:00/sbin/mingetty/dev/tty6
Root 16423 0.0 0.0 4064 528 tty1 ss+ 11:06 0:00/sbin/mingetty/dev/tty1
Root 16424 0.0 0.0 4064 532 tty2 ss+ 11:06 0:00/sbin/mingetty/dev/tty2
Root 16425 0.0 0.0 4064 532 tty3 ss+ 11:06 0:00/sbin/mingetty/dev/tty3

(2) This virtual terminal can modify the number of virtual terminals in the configuration file

[[Email protected] ~] #vim/etc/init/start-ttys.conf
ENV Active_consoles=/dev/tty[1-6]//For example [1-6] changed to [1-2]

[Email protected] ~]# Vim/etc/sysconfig/init

ACTIVE_CONSOLES=/DEV/TTY[1-6]//change [1-6] to [1-2]

[[Email protected] ~] #reboot

[[Email protected] ~]# PS aux | grep TTY
Root 1690 0.0 0.0 4064 536 tty1 ss+ 20:24 0:00/sbin/mingetty/dev/tty1
Root 1692 0.0 0.0 4064 528 tty2 ss+ 20:24 0:00/sbin/mingetty/dev/tty2

(3) See how many terminals are currently in use

Who, W, uptime can view several terminals being occupied, but W can display more information

[Email protected] ~]# W
20:32:22 up 8 min, 1 user, load average:0.00, 0.02, 0.01

From the last boot to the current amount of time, a user, the load value is: 5 minutes, 10 minutes, 15 minutes

USER TTY from [email protected] IDLE jcpu PCPU
Root pts/0 192.168.11.1 20:25 0.00s 0.12s 0.03s W

Who the user is, which terminal to occupy, where to come from, CPU-related values, what the action is

[email protected] ~]# who
Root pts/0 2016-06-21 20:25 (192.168.11.1)
[Email protected] ~]# uptime
20:32:46 up 8 min, 1 user, load average:0.00, 0.02, 0.00

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Linux Small Knowledge Terminal