Automatically Execute Commands Starting Your Shell
Whenever you open your terminal or shell it always has its default settings. There is a way that you can keep your aliases, your settings, and your personalized settings. Most shells have a file that you can place these commands so that they run every time that the shell is opened. The file is most likely a hidden file (meaning it starts with a "." character) located in your home directory.
It depends on what shell or terminal you run. For example if you use a bash shell you can create or edit (check if the file exists first) the .bashrc file in your home folder. Place in the file your alias and modified environment settings that you want to be run every time you start your shell. Do some quick research to find out if such a file exists for the shell that you use. Here is a simplified version of my own:
% cat .bashrc
alias ll="ls -l"
alias today='date +"%A, %B %d, %Y"'
customize the prompt »