Strange behaviour of ssh

[Philipp Marek]

Hello Lukas!

On Monday 07 November 2011, Lukas Razik wrote:
> I've Debian 6.0.3 with OpenSSH_5.5p1 and problem with the execution of
> remote commands via ssh.
...
> Here normally I should get the version information of mpirun twice but
> the first one fails: $ ssh cluster2 mpirun --version ; mpirun --version
> bash: mpirun: command not found
> mpirun (Open MPI) 1.4.3
> 
> Here I should get the place of "mpirun" twice but the first "which"
> doesn't find an "mpirun" and prints nothing: $ ssh cluster2 which mpirun
> ; which mpirun
> /usr/mpi/gcc/openmpi-1.4.3/bin/mpirun
> 
> The echo command prints the right "$PATH":
> $ ssh cluster2 echo "$PATH"
> /usr/mpi/gcc/openmpi-1.4.3/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/ga
> mes:/usr/games
> 
> So, does anyone of you have an idea what there could be wrong?
yes. The ";" is parsed by the _local_ shell, ssh only transmits the first 
part to the remote host - the rest is run locally.

And "$PATH" is expanded locally, too - try with '$PATH'.


To run multiple commands remotely you could try
    ssh cluster2  /bin/sh -c 'mpirun ; mpirun ; which mpirun; echo $PATH'


Regards,

Phil