First of all just trigger this command on any path and try to know that our system is been configured with some alias name for many tricky lengthy commands.
Now, lets have a look at how to define them.
we have some thing called temporary and permanent alias name. lets discuss one by one.
To define a temporary alias name ( i.e the alias name will exist only until that particular terminal is closed)
karthikk.desktop% alias <name of your choice>='<any linux command>'
karthikk.desktop% alias ec='eclipse.exe -clean'
To Define a permanent alias name (i.e the alias name will exist even if the system is rebooted.
In order set them, you have define your alias name in the .zhrsc/.bash_profile file and source the same.
karthikk.desktop% source $HOME/.bash_profile
karthikk.desktop% source $HOME/.zshrc
NOTE: .zshrc/.bash_profile generally reside in $HOME