Ubuntu Terminal Open Command

On OSX one can use the open command in the terminal to open a document using its associated program. Running open on a pdf file will open it using Preview. On Ubuntu the corresponding command is xgd-open. It is cumbersome to write that over and over again but we can add an alias in the .bashrc file

alias o="xdg-open"

If we, for example, want to open a pdf file we can write

o mydocument.pdf