Debian's which hunt

$ alias "fakeprogram"="/usr/bin/notarealprogram -a"

$ which fakeprogram; echo $?
1

$ command -v fakeprogram; echo $?
alias fakeprogram='/usr/bin/notarealprogram -a'
0

$ command -V fakeprogram; echo $?
fakeprogram is aliased to `/usr/bin/notarealprogram -a'
0