zsh で array を逆順に並べ替える
$ a=(spam egg foo bar)
$ print -l $a
spam
egg
foo
bar
$ print -l ${(Oa)a}
bar
foo
egg
spam
2011-02-02
$ a=(spam egg foo bar)
$ print -l $a
spam
egg
foo
bar
$ print -l ${(Oa)a}
bar
foo
egg
spam