[erlang-questions] : Deleting last line in the Erlang Shell

Raimo Niskanen <>
Thu Apr 26 09:14:15 CEST 2007


How about:

    io:get_line("\r"++lists:duplicate(80, $ )++"\rinput> ")


On Wed, Apr 25, 2007 at 04:19:53PM -0500, Jordan Wilberding wrote:
> That still doesn't quite do what I want to do, I want to have an input 
> line, then when you hit
> enter, get the input, you just clear the prompt and start over.
> 
> This is kind of what I want, but instead of writing over the previous 
> line, it writes over prompt.
> 
> -module(abc).
> -export([start/0]).
> start() ->
>   io:get_line('input> '),
>   io:format([13|"      "], []),
>   start().
> 
> So I want something like this
> 
> input> test (hit enter)
> 
> then I just get:
> 
> input>
> 
> instead I get:
> 
> input> test
> input>
> 
> Thanks!
> Jordan Wilberding
> 
> Torbjorn Tornkvist wrote:
> > Jordan Wilberding wrote:
> >   
> >> The \r doesn't seem to do anything in Erlang. Any other ideas?
> >>     
> >
> > Try this program, like this: erl -noshell -s abc
> > -------------------------------------------
> > -module(abc).
> > -export([start/0]).
> > start() ->
> >      [print(integer_to_list(I)) || I <- [1,2,3,4,5,6,7,8,9]], erlang:halt().
> > print(S) -> io:format([13|S], []), timer:sleep(1000).
> > ---------------------------------------------
> >
> > Cheers, Tobbe
> >
> >
> >
> >   
> >> Thanks!
> >> Jordan Wilberding
> >>
> >> Mazen Harake wrote:
> >>     
> >>> This reply is getting ugly... sorry for spaming your inboxes!
> >>>
> >>> the correct line should be
> >>>
> >>> io:format("\r")
> >>>
> >>> Cheers!
> >>>
> >>> Mazen wrote:
> >>>   
> >>>       
> >>>> Maybe an ugly way of doing it but on top of my head you can do
> >>>>
> >>>> io:format("r")
> >>>>
> >>>> which will bring you back on the same line (which you can then overwrite). Don't know if the there is a special way to do it. I have never actually done an command line interactive program in Erlang myself :)
> >>>>
> >>>>
> >>>> Guest wrote:
> >>>> Hello,
> >>>>
> >>>> I have a simple program that takes input via io:get_line/1 in a loop.
> >>>>
> >>>> However, when I hit enter I would like for it to just clear the line
> >>>> instead of printing a new input line. Is there any way to do this with
> >>>> in the erlang shell?
> >>>>
> >>>> Thanks!
> >>>> Jordan Wilberding
> >>>> _______________________________________________
> >>>> erlang-questions mailing list
> >>>> 
> >>>> http://www.erlang.org/mailman/listinfo/erlang-questions
> >>>>  Post recived from mailinglist
> >>>> (end of quote)
> >>>>
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> >>>>     
> >>>>         
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-- 

/ Raimo Niskanen, Erlang/OTP, Ericsson AB



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