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David Robins > Net-SSH2-0.18 > Net::SSH2::Channel



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Net::SSH2::Channel - SSH 2 channel object


A channel object is created by the Net::SSH2 channel method. As well as being an object, it is also a tied filehandle. The Net::SSH2 poll method can be used to check for read/write availability and other conditions.

setenv ( key, value ... )

Sets remote environment variables. Note that most implementations do not allow environment variables to be freely set. Pass in a list of keys and values with the values to set. Returns the number of successful sets.

blocking ( flag )

Enable or disable blocking. Note that this is currently implemented in libssh2 by setting a per-session flag; it's equivalent to Net::SSH2::blocking.


Returns true if the remote server sent an EOF.


Send an EOF to the remote. After an EOF has been sent, no more data may be sent; the connection should be closed.


Close the channel (happens automatically on object destruction).


Wait for a remote close event. Must have already seen remote EOF.


Returns the channel's program exit status.

pty ( terminal [, modes [, width [, height ]]] )

Request a terminal on a channel. If provided, width and height are the width and height in characters (defaults to 80x24); if negative their absolute values specify width and height in pixels.

process ( request, message )

Start a process on the channel. See also shell, exec, subsystem.


Start a shell on the remote host; calls process("shell").

exec ( command )

Execute the command on the remote host; calls process("exec", command). Note that only one of these requests can succeed per channel (cp. "exec" in perlfunc); if you want to run a series of commands, consider using shell instead.

subsystem ( name )

Run subsystem on the remote host; calls process("subsystem", command).

ext_data ( mode )

Set extended data handling mode:

normal (default)

Keep data in separate channels; stderr is read separately.


Ignore all extended data.


Merge into the regular channel.

read ( buffer, size [, ext ] )

Attempts to read size bytes into the buffer. Returns number of bytes read, undef on failure. If ext is present and set, reads from the extended data channel (stderr).

write ( buffer [, ext ] )

Attempts to write the buffer to the channel. Returns number of bytes written, undef on failure. If ext is present and set, writes to the extended data channel (stderr).

flush ( [ ext ] )

Flushes the channel; if ext is present and set, flushes extended data channel. Returns number of bytes flushed, undef on error.




David B. Robins, <>


Copyright (C) 2005, 2006 by David B. Robins; all rights reserved.

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.0 or, at your option, any later version of Perl 5 you may have available.

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