Source : Free On-Line Dictionary of Computing

cd tilde
     
        /C-D til-d*/ To go home.  From the {Unix} {C shell} and
        Korn-shell command "cd ~", which takes one to one's "$HOME"
        directory.  "cd" with no arguments does the same thing.
     
        [{Jargon File}]
     
        (1994-10-28)