Alias has been defined as a "parameterless macro"
.bashrc, .bash_aliases or .profile are the locations for the default aliases
NOTE: Aliases created in a shell will not survive across a reboot and an alias created in one shell will not work in another shell.
Thus you must create a nabackup of one of the above 3 files, then modify them... NOTE: normal users keep the above 3 files in /home/username, root is usually at /root sudo su uses the root profile settings...
Then reload them type . .bashrc or . .bash_aliases Note that this is a dot (".") followed by a space and another dot and the file name.
ls is actually an alias, but we can modify it such that alias ls='ls -al'
e.g. use aomx instead of the long command...
alias aomx='WINEPREFIX="/home/paul/.wine " wine "C:\Program Files\Microsoft Games\Age of Mythology\aomx.exe"'