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Full Discussion: Problem with perl openssh
Top Forums Shell Programming and Scripting Problem with perl openssh Post 302466804 by durden_tyler on Wednesday 27th of October 2010 10:50:07 AM
Old 10-27-2010
Quote:
Originally Posted by samohung390
...
my problem is that it keeps returning errors that I dont understand, it says:
use of uninitialized value $default_stdin_fh in anonymous hash....
almost the whole errors says like this but changes to $default_stdout_fh,$default_stderr_fh,$master_stdi n_fh........

what does these error mean?
It means exactly what it says.
$default_stdin_fh has not been initialized, and therefore perl shows that warning.

A very short example might help in understanding this better -

Code:
$
$ perl -wle 'my $x; if ($x eq "hello") {print "HELLO"}'
Use of uninitialized value $x in string eq at -e line 1.
$
$

I declared the scalar $x, but did not initialize it. Perl doesn't know how to compare a literal string "hello" with an uninitialized value of $x. So it shows the warning.

Note that it's a warning, not an error. If I remove the "-w" flag, then this will not be shown.

Code:
$
$ perl -le 'my $x; if ($x eq "hello") {print "HELLO"}'
$

That's the same as removing the "use warnings" statement from a Perl program file - although it's highly recommended to retain it.

Of course, the problem isn't fixed by turning warnings off. You'll have to actually initialize the scalar/array/hash/whatever to make your program work.

tyler_durden
 

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LEARN ABOUT SUNOS

sftp-server

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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