Question on system function

kprasanna_79 has asked for the wisdom of the Perl Monks concerning the following question:

Revered Monks,
I am running a binary file using system command and below is how i run it

sub {
$file=shift;
system "abc -add $file";
($? != 0) ? return 0 : return 1;
}
[download]

Its not showing me the input paramete option, where in binary i have asked to get a input from the user. I believe that is routed to different screen or trash. See below when i run the binary...

File contains 1 new key(s). Add these keyring ? (Y/n) Y
[download]

This particular line was not shown when i run through the perl script.
even i tried with qx and backtic. That didnt work.... Please any suggestion....
-Prasanna.K

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Re: Question on system function by apl (Monsignor) on May 07, 2008 at 20:33 UTC
If I understand your question correctly, and assuming you're using *nix, you should probably change `system "abc -add $file";` [download] to `system "abc -add $file >abc.out 2>abc.err";` [download] You should see the messages in one file or the other.	[reply] [d/l] [select]
Re: Question on system function by carol (Beadle) on May 07, 2008 at 21:04 UTC
If your abc program is perl also, use `<STDIN>` explicitly; not `<>`. In what follows echo.pl is your abc. kprasanna.pl is the script calling it. echo.pl: `use strict; use warnings; my $arg = $ARGV[0]; my $line = <STDIN>; # bare <> won't work print "argument was $arg\ninputline was $line";` [download] kprasanna.pl: `use strict; use warnings; my $file = $ARGV[0]; system "./echo.pl $file";` [download] Running it: `duper:~/pp carol$ ./kprasanna.pl a_filename hello kprasanna # typed in at terminal argument was a_filename inputline was hello kprasanna duper:~/pp carol$` [download] Hope it helps.	[reply] [d/l] [select]
Re: Question on system function by pileofrogs (Priest) on May 07, 2008 at 20:24 UTC
Are you running your script from the command line or from a cron job or something like that? If you don't have a tty, abc can know that and behave differently. You can fool it into thinking you have a tty when you don't, but I'm not sure off the top of my head how you do that. Expect probably has that capability. Soooo, I recommend you check out Expect. It looks like you're automating gpg. There might be gpg helper modules on CPAN as well. --Pileofrogs	[reply]


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