You can also call c library functions.
l=.({.~i.&LF)memr b,0,s[(c,' fgets *c *c i *')cd(<b=.mema
s);(s=.256);<f=.{.(c,' fdopen * i *c')cd(d=.0 cd~' dup > i i',~c=.unxlib'c');1
1$'r'
hello read line
(;$)l
┌───────────────┬──┐
│hello read line│15│
└───────────────┴──┘
(c,' fclose i *')cd<f
> On Jun 19, 2018, at 8:13 PM, Raul Miller <[email protected]> wrote:
>
> Actually, thinking about this - 1!:1 reads the whole file, so it's
> stty won't make a difference .- you'd need to use control-D to
> terminate everything you send to it interactively.
>
> One approach - not incredibly efficient, but interactive
> line-at-a-time input isn't about efficiency, might be:
>
> LINE=: 2!:0'read line; echo "$line"'
>
> This relies on 2!:0 being handled by /bin/sh (and note that you'll get
> a trailing LF character when you do this). The double quotes are so
> that redundant whitespace isn't removed by the shell...
>
> Or, if you want that as a verb:
>
> readline=: 2!:0 bind 'read line; echo "$line"'
>
> I hope this helps.
>
> --
> Raul
> On Tue, Jun 19, 2018 at 8:57 PM Raul Miller <[email protected]> wrote:
>>
>> Ah.. experimenting with this:
>>
>> stdin'' reads till end of file (hit control-D to finish input)
>> readln'' as defined in this thread returns immediately, reading an empty
>> string.
>>
>> At least on *my* system.
>>
>> I tried running
>>
>> stty eol ^J before starting J, thinking that would fix it, but it did
>> not. But I'm running OSX where it might be that there's some "new and
>> improved" mechanism for defining the end of line character.
>>
>> Anyways, this is likely an OS issue and the solution probably will
>> depend on your OS.
>>
>> I hope this helps,
>>
>> --
>> Raul
>>
>> On Tue, Jun 19, 2018 at 8:41 PM Eric Iverson <[email protected]>
>> wrote:
>>>
>>> I think the replies here miss an important part of the question. The #!
>>> script.
>>>
>>> #! /usr/bin/j8
>>> stdin''
>>>
>>> On Tue, Jun 19, 2018 at 8:21 PM, Don Guinn <[email protected]> wrote:
>>>
>>>> It appears that the right argument is ignored. Perhaps have it be displayed
>>>> on the same line as the input.
>>>>
>>>> readln 'Name: '
>>>>
>>>> On Tue, Jun 19, 2018 at 6:18 PM Raul Miller <[email protected]> wrote:
>>>>
>>>>> 1 -:&(3!:3) 01
>>>>> 1
>>>>>
>>>>> No difference in what's represented, so the only difference is in how
>>>>> you type it / the leading zero / ...
>>>>>
>>>>> Thanks,
>>>>>
>>>>> --
>>>>> Raul
>>>>>
>>>>> On Tue, Jun 19, 2018 at 8:15 PM Devon McCormick <[email protected]>
>>>>> wrote:
>>>>>>
>>>>>> How does "01" differ from "1" in this context?
>>>>>>
>>>>>> "readln" works for me within a session but I think James wants to do
>>>>>> something like pipe input into a J script. This is not something I've
>>>>> done
>>>>>> but it would be interesting if we can do it.
>>>>>>
>>>>>> On Tue, Jun 19, 2018 at 5:10 PM, Henry Rich <[email protected]>
>>>>> wrote:
>>>>>>
>>>>>>> ? The 01 is correct as it stands. On Windows I get correct
>>>> operation:
>>>>>>>
>>>>>>> readln =: [: (1!:01) 1:
>>>>>>> readln''
>>>>>>> abcdefg
>>>>>>> abcdefg
>>>>>>>
>>>>>>> The first line is what I typed, the second is the JE's result
>>>>>>>
>>>>>>> Henry Rich
>>>>>>>
>>>>>>>
>>>>>>> On 6/19/2018 5:05 PM, james faure wrote:
>>>>>>>
>>>>>>>> Either way, it's no good
>>>>>>>>
>>>>>>>> ________________________________
>>>>>>>> From: Programming <[email protected]> on
>>>>> behalf
>>>>>>>> of devonmcc <[email protected]>
>>>>>>>> Sent: Tuesday, June 19, 2018 11:00:39 PM
>>>>>>>> To: [email protected]
>>>>>>>> Subject: Re: [Jprogramming] getline
>>>>>>>>
>>>>>>>> The "01" following the "!:" is probably supposed to be "0]1".
>>>>>>>>
>>>>>>>>
>>>>>>>> Sent from my Verizon, Samsung Galaxy smartphone
>>>>>>>> -------- Original message --------From: Michal Wallace <
>>>>>>>> [email protected]> Date: 6/19/18 16:06 (GMT-05:00) To:
>>>>>>>> [email protected] Subject: Re: [Jprogramming] getline
>>>>>>>> readln =: [: (1!:01) 1:
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> On Tue, Jun 19, 2018 at 2:45 PM james faure <[email protected]
>>>>>
>>>>>>>> wrote:
>>>>>>>>
>>>>>>>> Hello, how can one read stdin one line at a time ?
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> #! /usr/bin/j8
>>>>>>>>>
>>>>>>>>> stdin''
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> is no good.
>>>>>>>>>
>>>>> ----------------------------------------------------------------------
>>>>>>>>> For information about J forums see
>>>>> http://www.jsoftware.com/forums.htm
>>>>>>>>>
>>>>>>>> ------------------------------------------------------------
>>>> ----------
>>>>>>>> For information about J forums see
>>>>> http://www.jsoftware.com/forums.htm
>>>>>>>> ------------------------------------------------------------
>>>> ----------
>>>>>>>> For information about J forums see
>>>>> http://www.jsoftware.com/forums.htm
>>>>>>>> ------------------------------------------------------------
>>>> ----------
>>>>>>>> For information about J forums see
>>>>> http://www.jsoftware.com/forums.htm
>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> ---
>>>>>>> This email has been checked for viruses by AVG.
>>>>>>> https://www.avg.com
>>>>>>>
>>>>>>>
>>>>>>> ------------------------------------------------------------
>>>> ----------
>>>>>>> For information about J forums see http://www.jsoftware.com/
>>>> forums.htm
>>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>>
>>>>>> Devon McCormick, CFA
>>>>>>
>>>>>> Quantitative Consultant
>>>>>> ----------------------------------------------------------------------
>>>>>> For information about J forums see http://www.jsoftware.com/forums.htm
>>>>> ----------------------------------------------------------------------
>>>>> For information about J forums see http://www.jsoftware.com/forums.htm
>>>> ----------------------------------------------------------------------
>>>> For information about J forums see http://www.jsoftware.com/forums.htm
>>>>
>>> ----------------------------------------------------------------------
>>> For information about J forums see http://www.jsoftware.com/forums.htm
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
----------------------------------------------------------------------
For information about J forums see http://www.jsoftware.com/forums.htm
