Dear Fletch,

Thanks for the reply.
... the program is checking if it's stdout is a TTY or not and behaving differently based upon that.
But, the strange thing in my setting is that one parameter ('A') works well, but not the other ('B')?

From what I understand of your statement above, under both parameters the system call should fail. Please correct me if I'm wrong.
You could check by using your shell to redirect the output into a file and see if it behaves similarly.
Actually it runs under CGI script. And following your suggestion, I did pass the output into a file using standard open file handle. 
#!/usr/bin/perl -w
use strict;
use CGI qw/:standard/;
use Data::Dumper;
use Carp;


print header();


my $param = 'A'; # or otherwise not working 'B'

my  $OUTFILE_file_name = 'out.txt';       

@output = `some_binary.out $param`;
chomp output;

open ( OUTFILE, '>', $OUTFILE_file_name )
    or croak "$0 : failed to open $OUTFILE_file_name : $!\n";

print OUTFILE Dumper \@output;

close ( OUTFILE );

[download]
But the out.txt shows nothing, i.e it gives: $VAR1=[];

---
neversaint and everlastingly indebted.......

In reply to Re^2: Strange Behaviour with Backticks by neversaint
in thread Strange Behaviour with Backticks by neversaint

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