Terminal personalization.

.profile

# Enable ls colors by default.
alias ls="ls -G"

# For convenience.  Changes the current directory and immediately displays its contents.
cdls() { cd "$@" && ls; }

# Use Shared as the default working directory.
cd /Users/Shared

# For the hell of it.  Print a randomly-colored Aperture Science logo on login.
echo -en "\033[3$(Digit=$RANDOM; let Digit=Digit%7+1; echo $Digit)m"
echo -e '
                                 .,-:;//;:=,
                             . :H@@@MM@M#H/.,+%;,
                          ,/X+ +M@@M@MM%=,-%HMMM@X/,
                        -+@MM; $M@@MH+-,;XMMMM@MMMM@+-
                       ;@M@@M- XM@X;. -+XXXXXHHH@M@M#@/.
                     ,%MM@@MH ,@%=            .---=-=:=,.
                     =@#@@@MX .,              -%HX$$%%%+;
                    =-./@M@M$                  .;@MMMM@MM:
                    X@/ -$MM/                    .+MM@@@M$
                   ,@M@H: :@:                    . =X#@@@@-
                   ,@@@MMX, .                    /H- ;@M@M=
                   .H@@@@M@+,                    %MM+..%#$.
                    /MMMM@MMH/.                  XM@MH; =;
                     /%+%$XHH@$=              , .H@@@@MX,
                      .=--------.           -%H.,@@@@@MX,
                      .%MM@@@HHHXX$$$%+= .:$MMX =M@@MM%.
                        =XMMM@MM@MM#H;,-+HMM@M+ /MMMX=
                          =%@M@M#@$-.=$@MM@@@M; %M%=
                            ,:+$+-,/H#MMMMMMM@= =,
                                  =++%%%%+/:-.
\033[0m
                                 Welcome back.\n'