So far, we have been creating temporary aliases; that is, the two aliases of memory and date that we created are temporarily and only valid for the current Terminal session. These two aliases will vanish as soon as you close your Terminal.
Open a new Terminal session, then try and run the two aliases we have created:
elliot@ubuntu-linux:~$ date
Mon Nov 4 13:43:46 CST 2019
elliot@ubuntu-linux:~$ memory
Command 'memory' not found, did you mean:
command 'lmemory' from deb lmemory
Try: sudo apt install <deb name>
As you can see, they are gone! They are not even in your list of aliases anymore:
elliot@ubuntu-linux:~$ alias
alias egrep='egrep --color=auto'
alias fgrep='fgrep --color=auto'
alias grep='grep --color=auto'
alias l='ls -CF'
alias la='ls -A'
alias ll='ls -alF'
alias ls='ls --color=auto'
To create a permanent alias for a user, you need to include it in the hidden...