In Unix based operating systems it is quit easily create your own convenient commands using alias. This is particularly helpful when you use certain shell commands in a regular basis. To create alias
list you should create or edit ~/.bashrc. Here is how you do it.
Open the Terminal.app
If the file exists you can scroll down to the bottom and press i to insert some aliases
alias ll = 'ls -l'
alias dfile = 'rm -f'
alias dfolder = 'rm -rf'
alias md = 'mkdir'
alias v = 'vim'
alias c = 'clear'
Hit Esc, type :wq and hit Return to exist Vim editor.
The above aliases to be binding, you have to start the Terminal.app
If you want to check the existing aliases, type alias and hit Return.
You can temporarily deactivate an alias using unalias command.
Eg. unalias la would temporarily deactivate la alias that I previously created.