...
Since jobs execute on compute nodes you should include this in a simple shell script along with your sbatch command, so that the new setting takes effect on the compute node as well.
Sometimes I would like to have multiple shells available on the login node, how to proceeddo I do this?
There are many ways. Most often you may just login two or more times from your desktop. Or, refer to the slurm section with examples using srun. Do
It is best not to ssh into the cluster while you are on the login node of the cluster.