At 11:29 +0200 2007/05/27, david alis wrote:
When I start jw on ubuntu64 and run the following:
'a b c' =. 2!:2 '/usr/bin/perl -n -e ' "print" '
the j session vanishes.
Where can I find examples of using 2!:2?
(I've tried the FindInFiles but I didnt find anything useful).
In perl I can use a pipe as if were an input file - (for example):
open F, 'cat inputfile | tr -d "7Z" |";
@wholefile = <F>; # the variable @wholefile will contain either 7 or Z
Would I use 2!:2 to do something similar?
Thanks in advance.
David
I agree with Raul that you have a wayward ' in your j expression.
----
version ''
Binary: j601binc_darwin_powerpc
Library: j601libc
Help: j601hlpc
Engine: j601/2006-11-17/17:05
ProductName: Mac OS X
ProductVersion: 10.4.9
BuildVersion: 8P135
java version "1.5.0_07" Java(TM) 2 Runtime Environment, Standard
Edition (build 1.5.0_07-164) Java HotSpot(TM) Client VM (build
1.5.0_07-87, mixed mode, sharing)
'a b c' =. 2!:2 '/usr/bin/perl -n -e "print" '
a
2556
b
_1610556620
c
_1610556532
1!:20 ''
+-----------+------------------------------+
|_1610556620|</usr/bin/perl -n -e "print" |
+-----------+------------------------------+
|_1610556532|>/usr/bin/perl -n -e "print" |
+-----------+------------------------------+
host =: 2!:0 :: 0:
host 'ps -aux | grep 2556'
jkt 2563 0.7 0.0 27812 580 p2 R+ 9:35AM 0:00.01
sh -c ps -aux | grep 2556 > /var/tmp/tmp.4.oglJt2
jkt 2556 0.0 0.0 27248 448 p2 S+ 9:33AM 0:00.01
/usr/bin/perl -n -e print
jkt 2565 0.0 0.0 27812 4 p2 R+ 9:35AM 0:00.00 grep 2556
NB. So the process is running as expected with PID a - but
'Where does this go?' 1!:2 b
1!:1 c
|limit error
| 1!:1 c
NB. I don't know....
----
I'm guessing that your idea is to run some kind of filter in the
host environment and send/receive stdin/stdout - I would be
interested in doing that too. I like being able to read stdin in
#! j scripts - but the external filter would be nice, egrep leaps
to mind as useful. Let me know if you puzzle it out.
- joey
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