Kernel.open

Ruby
1

Hi all,

I am trying to run an external commands with Kernel.open writing and
reading its standard input / output several times. Unfortunately the
script hangs when trying to read with IO.gets.

Code:
fh = Kernel.open("|hunspell -m", “w+”)

fh.puts “ruby\n”
output = fh.gets()
puts output

fh.puts “rails\n”
output = fh.gets()
puts output

fh.close()

I’ve noticed that the script runs fine if I try to run hunspell without
the ‘-m’ parameter (-m is for morhological analysis). What do I do wrong
here?

Thanks!

2

Imre Farkas wrote:

Hi all,

I am trying to run an external commands with Kernel.open writing and
reading its standard input / output several times. Unfortunately the
script hangs when trying to read with IO.gets.

Maybe because gets requires a closing newline?
-r

3

Roger P. wrote:

Maybe because gets requires a closing newline?
-r

…and hunspell puts a closing newline after the output. So that
shouldn’t be the problem.

4

Imre Farkas wrote:

Hi all,

I am trying to run an external commands with Kernel.open writing and
reading its standard input / output several times. Unfortunately the
script hangs when trying to read with IO.gets.

Code:
fh = Kernel.open("|hunspell -m", “w+”)

fh.puts “ruby\n”

Try here: fh.flush
(or: fh.sync = true after opening it)

I would normally use IO.popen, but I don’t know how/if that differs from
using open in the way you have.