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Full Discussion: SSH in batch mode and File-Handles in a loop
Top Forums Shell Programming and Scripting SSH in batch mode and File-Handles in a loop Post 302112820 by ennstate on Friday 30th of March 2007 03:38:05 PM
Old 03-30-2007
I too get the same error,ie the SSH session is entered once, in case of while loop.

But it doesnot seems to happen if i use for inplace of while

for host in $(</tmp/hosts); do
echo "Executing on the $host"
ssh $host 'ls -lrt /tmp'
echo $host
done

cat /tmp/hosts
user1@localhost
remote@localhost
others@localhost

Gurus,
Help us why did the code as in OP using the while doesnot work,but using the for loop is works?

Thanks
Nagarajan Ganesan
 

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LEARN ABOUT CENTOS

libssh2_channel_direct_tcpip_ex

libssh2_channel_direct_tcpip_ex(3)				  libssh2 manual				libssh2_channel_direct_tcpip_ex(3)

NAME

       libssh2_channel_direct_tcpip_ex - Tunnel a TCP connection through an SSH session

SYNOPSIS

       #include <libssh2.h>

       LIBSSH2_CHANNEL * libssh2_channel_direct_tcpip_ex(LIBSSH2_SESSION *session, const char *host, int port, const char *shost, int sport);

       LIBSSH2_CHANNEL * libssh2_channel_direct_tcpip(LIBSSH2_SESSION *session, const char *host, int port);

DESCRIPTION

       session - Session instance as returned by libssh2_session_init_ex(3)

       host - Third party host to connect to using the SSH host as a proxy.

       port - Port on third party host to connect to.

       shost - Host to tell the SSH server the connection originated on.

       sport - Port to tell the SSH server the connection originated from.

       Tunnel  a TCP/IP connection through the SSH transport via the remote host to a third party. Communication from the client to the SSH server
       remains encrypted, communication from the server to the 3rd party host travels in cleartext.

RETURN VALUE

       Pointer to a newly allocated LIBSSH2_CHANNEL instance, or NULL on errors.

ERRORS

       LIBSSH2_ERROR_ALLOC -  An internal memory allocation call failed.

SEE ALSO

       libssh2_session_init_ex(3)

libssh2 0.15							    1 Jun 2007					libssh2_channel_direct_tcpip_ex(3)
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