Why bash aliases commands are not working?

Question

I am facing a problem with bash alias in Kali linux. Let me tell from the beginning.

I want to set some command to save time from writing it again and again. So, I used

nano /.bash_aliases

and set a command line

alias up='sudo apt update && sudo apt full-upgrade'

then I press Ctrl+V and hit y then hit Enter. I closed the terminal and open it. When I put up and press enter it shows:

up: command not found

Then I searched for solution and find one telling to do this.

gedit .bashrc

In the .bashrc file this is written without any '#'

if [ -f ~/.bash_aliases ]; then
    . ~/.bash_aliases
fi

Then I get into bash_aliases file with this command

gedit bash_aliases

And write this and save...

alias up='sudo apt update && sudo apt full-upgrade'

and close the terminal. In new terminal that same error happens. No command found. I have also do these in order to solve this problem:

• reboot my pc

• totally turned off and again turn on my pc

• Try some random solutions like

   source ~/.bashrc
   bash -i -c my_alias
  

But I found the problem again and again. Here is a screen shot if I forgot to add any details. Thanks in advance.

Answer 1

explaining

if [ -f ~/.bash_aliases ]; then
    . ~/.bash_aliases
fi

• this means if there's a file with the name of .bash_aliases then source that file. The . in bash is the same as source, example: . .bash_aliases or source .bash_aliases,the same just a shortcut.
• ~/ is a shortcut for your home directory, meaning, /home/agent/.You're sourcing in the root directory. That's why you are logged as root in the terminal. When you source ~/.bash_aliases nothing happens because you are sourcing a file that doesn't have your alias up.

source /home/agent/.bash_aliases

solution

don't do it as root, do it as your user[agent]
a. remove the .bash_aliases from the root / directory

sudo rm /.bash_aliases 

b. open with gedit your file .bash_aliases at HOME DIRECTORY and notice the . in front of .bash_aliases

gedit /home/agent/.bash_aliases` #and add your alias
alias up='sudo apt update && sudo apt full-upgrade'

c. source file .bashrc and this will automatically source the .bash_aliases
(remember the if [-f ~/.bash_aliases]; then at the beginning?)

source /home/agent/.bashrc

d. you can check your aliases with the command alias -p