Everytime I use these keys in the interpreter I keep getting symbols like this appearing:
[[D^[[C
I'm using Linux Mint 12 in ZSH, however I'm getting the same result in Ubuntu with bash. Also, same thing in ssh.
The stock OCaml toplevel doesn't have line editing built in. I use rlwrap:
$ cat bin/ocaml
#!/bin/sh
exec rlwrap /usr/local/bin/ocaml "$@"
Using the toplevel without something like this is quite painful, in my opinion!
Other possibilities are to run the toplevel under emacs (a popular choice, I think), or to use utop. I haven't used utop, but it sounds cool.
Another option is to use:
ledit ocaml
Although I prefer utop over anything else myself.
来源：https://stackoverflow.com/questions/13225070/is-it-possible-to-use-arrow-keys-in-ocaml-interpreter