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System Control

 

1. Check Internet Speed

user@machine:~$ speedtest-cli    # Install: pip install speedtest-cli

 

2. How to reduce terminal text? / Customizing BASH Prompt Text

user@machine:~$ PS1='[\u@\h \W]\$ '                       # Small
user@machine:~$ PS1='[@ \W]\$ '                           # Extra Small

 

3. Find the MAC Address

user@machine:~$ ifconfig | grep 'HWaddr' 

# Go to router icon --> Connection Information --> General

 

4. Fixed the Compiz Configure Issue

user@machine:~$ dconf reset -f /org/compiz
user@machine:~$ setsid unity  # (If doesn't work: sudo apt install unity.)
user@machine:~$ unity --reset-icons

 

5. TTY Mode

user@machine:~$ sudo chvt 7                            # Try 1, 2, 3, ... 7 

# or, we can use shortcut key: control + alter + F7    # Try F1, F2, F3, ... F7

 

6. Create a New User and Remove the Root Privilege

user@machine:~$ sudo adduser anyName           ### Add a New User
user@machine:~$ sudo usermod -aG sudo anyName  ### Add the Root Privilege
user@machine:~$ sudo gpasswd -d anyName sudo   ### Remove the Root Privilege

  • References:

    1. Create a SUDO User (web)
    2. Remove the Root Privilege-1 (web)
    3. Remove the Root Privilege-2 (web)
    4. Create User and Remove the Root Privilege (web)
    5. Restore the Root Privilege (web)

 

8. Program Killing Procedure:

  • Step 1: Show the all running program

    user@machine:~$ top                     # dynamic
user@machine:~$ ps aux                  # static
user@machine:~$ ps aux | grep '<PID>'   # Find a particular process with details

  • Step 2: Kill program(s)

    user@machine:~$ kill 3288             # Kill a particular program
# Example: Here, 3288 is the process identity (PID), Then the program (3288) will halt.

user@machine:~$ kill -9 3288          # Kill a particular program forcefully. It is especially helpful for the GPU system.
user@machine:~$ kill -9 -1            # Kill all the program

 

9. Boot a Pendrive for the Linux-based OS:

  • Step 1: Findout the Pendrive

    user@machine:~$ ls /dev/sd    # Press the Tab (NOT the Enter)
    No Pendrive Pendrive Exist

  • Step 2: Boot the Pendrive

    user@machine:~$ sudo dd if=anyName.iso of=/dev/sdx bs=4M status=progress && sync   # x = {b, c, d, ...}

 

10. Wi-Fi Reboot for Linux

nmcli radio wifi off
echo 'Wi-Fi is turned off. Internet will appear within 15 seconds if everything goes smoothly.'
sleep 10 # Pause for 10 seconds
nmcli radio wifi on
echo 'Wi-Fi will turn on after a few seconds.'

11. Battery Timing

https://askubuntu.com/questions/69556/how-do-i-check-the-batterys-status-via-the-terminal