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Top Forums Shell Programming and Scripting Perl hashes "Can't use subscript on private hash" Post 302217480 by Smiling Dragon on Tuesday 22nd of July 2008 11:56:10 PM
Old 07-23-2008
Question Perl hashes "Can't use subscript on private hash"

This is driving me mad, where am I going wrong?

The relevant segment of code:
Code:
sub getndsybcons {
        my @servers=@{$_[0]};
        my @sybservers=@{$_[1]};
        my %results;
        foreach my $server(@servers) {
                my $biggestsyb;
                my $biggestsybval=0;
                foreach my $sybserver(@sybservers) {
                        open(NETSTAT,"$config{'su'} - $config{'user'} -c \'ssh $server \"netstat -a\"\' | grep $sybserver | wc -l|") || return;
                        while(<NETSTAT>) { $tempval=$_ }
                        if ($tempval > $biggestsybval) {
                                $biggestsybval=$tempval;
                                $biggestsyb=$sybserver;
                        }
                }
                if ($biggestsybval > 5) {
                        $results{$server}=$biggestsyb;
                } else {
                        $results{$server}="";
                }
        }
        return %results;
}

The error:
Code:
Can't use subscript on private hash at ./ib-lib.pl line 22, near "$server}"
(Did you mean $ or @ instead of %?)
Can't use subscript on private hash at ./ib-lib.pl line 24, near "$server}"
(Did you mean $ or @ instead of %?)

Lines 22 and 24 are bolded.

This code is for a webmin module to control an application's various components.
This bit of perl is part of a library of functions called by the main GUI interface code. Webmin provides the %config structure.

I've never been that great with hashes at the best of times but this one's got me really boggled.

It feels like I've got my variable declarations wrong (I'm attempting to minimise global variables that are not used as constants (eg %config), but have been finding this rather fiddly as I'm _very_ rusty at "real" coding Smilie ) but I don't seem to be getting anywhere playing round with it...

Can someone cast some light on this for me?
 

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sftp-server(1M)                                           System Administration Commands                                           sftp-server(1M)

NAME
sftp-server - SFTP server subsystem SYNOPSIS
/usr/lib/ssh/sftp-server DESCRIPTION
sftp-server implements the server side of the SSH File Transfer Protocol as defined in the IETF draft-ietf-secsh-filexfer. sftp-server is a subsystem for sshd(1M) and must not be run directly. There are no options or config settings. To enable the sftp-server subsystem for sshd add the following to /etc/ssh/sshd_config: Subsystem sftp /usr/lib/ssh/sftp-server See sshd_config(4) for a description of the format and contents of that file. There is no relationship between the protocol used by sftp-server and the FTP protocol (RFC 959) provided by in.ftpd. EXIT STATUS
The following exit values are returned: 0 Successful completion. >0 An error occurred. FILES
/usr/lib/sftp-server ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWsshdu | +-----------------------------+-----------------------------+ |Interface Stability |Evolving | +-----------------------------+-----------------------------+ SEE ALSO
sftp(1), ssh(1), ssh-add(1), ssh-keygen(1), sshd(1M), sshd_config(4), attributes(5) To view license terms, attribution, and copyright for OpenSSH, the default path is /var/sadm/pkg/SUNWsshdr/install/copyright. If the Solaris operating environment has been installed anywhere other than the default, modify the given path to access the file at the installed location. AUTHOR
Markus Friedl SunOS 5.10 30 Jul 2003 sftp-server(1M)
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