| Author |
Message |
< Erlang ~ How to read STDIN without prompt |
| lyntongrice |
 Posted: Thu Mar 25, 2010 8:32 am |
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Joined: 25 Mar 2010
Posts: 4
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Hi there,
Quick one, in C I can use GETS to read STDIN, in Python I can use sys.stdin.read().
In Erlang I can see I can use io:read()...like:
read([IoDevice,] Prompt) -> Result
What I am trying to do is have Erlang read STDIN just like C or Python with no prompt...is this easy?
Thanks
Lynton |
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| bpuzon |
| Posted: Thu Mar 25, 2010 12:34 pm |
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User
Joined: 05 Aug 2009
Posts: 23
Location: Cracow, Poland
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Code: io:read([IoDevice], ""). |
_________________
Saludos,
Bartłomiej Puzoń
Erlang Solutions |
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| lyntongrice |
| Posted: Fri Mar 26, 2010 4:03 am |
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Joined: 25 Mar 2010
Posts: 4
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Hi there,
Thanks for the response, much appreciated 
I guess what I am trying to do is execute something like the following on my windows machine:
echo hello | erl receiver execute | result.txt
And here is the code below for "receiver.erl"
Code: -module(receiver).
-export([execute/0]).
execute() ->
Data = io:read(standard_io, ""),
io:format(Data),
io:write(standard_io, "Done").
I want to simply read STDIN and print out some value to STDOUT...which ends up in a file called "result.txt".
Also why can I not do the following?
erl receiver execute | result.txt
It says "'result.txt' is not recognized as an internal or external command..."
Any ideas? Thanks for the help
Lynton |
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| Michal Ptaszek |
| Posted: Fri Mar 26, 2010 8:42 am |
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Joined: 01 May 2008
Posts: 35
Location: Krakow
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Using pipe (|) simply redirects standard I/O to the next process in line. If you would like to dump the output to the file, use redirection operator:
echo hello | erl receiver execute > result.txt
Or, if you like to save the data AND redirect it to the next process, use tee
echo hello | erl receiver execute | tee result.txt | ANOTHER_PROCESS |
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| lyntongrice |
| Posted: Fri Mar 26, 2010 10:05 am |
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Joined: 25 Mar 2010
Posts: 4
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Hi there,
Many thanks for the feedback, much appreciated
Can you copy the code from my receiver.erl above and try get the following to work...
echo hello | erl receiver execute > result.txt
Sure, the output is sent to file "result.txt" but there is an error ;-(
Can you try it out for me?
Thanks
Lynton |
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| jwatte |
| Posted: Fri Apr 09, 2010 2:10 am |
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Joined: 10 Feb 2010
Posts: 34
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| I think you'll need to copy & paste to post the error in question for anyone to help you. |
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| wuji |
| Posted: Mon Sep 17, 2012 8:09 am |
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Joined: 10 Aug 2012
Posts: 654
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| dongdongwu |
| Posted: Wed Sep 19, 2012 3:20 am |
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