# populate path
typeset -U path # make path a unique array
[[ -d ~/bin ]] && path=(~/bin $path)
+[[ -d /extra ]] && path=($path /extra/bin /extra/usr/bin /extra/sbin /extra/usr/sbin)
[[ -d /opt/android-sdk ]] && path=($path /opt/android-sdk/platform-tools)
# source aliases