Mine

$ alias dorf='cd ~/games/df_linux; ./df'
$ alias
alias dorf='cd ~/games/df_linux; ./df'
alias grep='grep --colour=auto'
alias ls='ls --color=auto'
$ dorf
(It works)
(Close and reopen terminal)
 $ dorf
bash: /usr/local/bin/dorf: Permission denied
$ alias
alias grep='grep --colour=auto'
alias ls='ls --color=auto'