Okay I can see several issues with your code.

First off what you are actually doing here can be done with a simple qx// or backticks. print qw/$cmd/ could replace your loop. This code would be much more sensible than what you are doing if what you intend is simply to get the output of running $cmd.

Note: You should be running with taint checks on when running user input in the shell if there is more to this program then simply providing a direct wrapper around bash from the shell.

However if you require a persistent shell (though I don't see why you would in normal situations) then you are on the right track. The first problem is that for a persistent shell you would want to move open2 and the autoflush statements outside the loop. You should also print more than one line of output from the shell in the loop.
Here is my code to accomplish this task: 

#same initialization
my $pid = open2( \*Reader, \*Writer, "/bin/bash" ) or warn $!;
Writer->autoflush();
Reader->autoflush();
STDIN->autoflush();
$SIG{ALRM} = sub {die}; # required for alarm call below
do {
    print ": "; # simple prompt
    my $cmd = <STDIN>;
    print Writer $cmd;
    my $got;
    while (1) {
        eval { alarm 3; $_=<Reader> }; # get line in 3 seconds or stop
+ reading
        alarm 0;
        last if ($@ or !(defined($_))); # exit loop if there was a tim
+eout or no data
        $got .= $_;
    }
    print $got;
} while(1);

[download]
If you need help understanding this code or have further problems, feel free to ask.

In reply to Re: Usage of IPC::Open2 ... by repson
in thread Usage of IPC::Open2 ... by galande

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