get the pid of a process with pexpect

[Nick Craig-Wood]

Karim Bernardet <bernardet at cppm.in2p3.fr> wrote:
>  Hi
> 
>  I am using pexpect to do ssh tunneling and to open a vnc server (jobs on 
>  a grid cluster). When the job is canceled, these 2 processes remain on 
>  the worker node (they are detached), so I have to kill them (using a 
>  trap command in the bash script of the job) but I need the pid of each 
>  process. I have tried to get it like this
> 
>  ssh_tunnel = pexpect.spawn (tunnel_command % globals())
>  ...
>  print ssh_tunnel.pid
> 
>  but ssh_tunnel is not the pid of the ssh tunnel
> 
>  Is there a way to get it using pexpect ?

If I understand you correctly what you need to do is run "echo $$" on
the remote shell then "exec tunnel_command".  The $$ will print the
pid and the exec will run tunnel_command without changing the pid.

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick