EURORA configuration of PBS environment has been changed since June 2015.  
To be able to activate a batch job you have now to add the following 
parameters to the qsub command: -W group_list=train_cplm2015 -q parallel

It could be handy to launch the executions using a script file, containing 
PBS parameters and the commands to be executed. As an example:
#!/bin/sh
#PBS -N test
#PBS -r n
#PBS -j oe
#PBS -l walltime=1:00:00
#PBS -l select=1:ncpus=4:mpiprocs=4
#PBS -A train_cplm2015
#PBS -W group_list=train_cplm2015
#PBS -q parallel
cd $PBS_O_WORKDIR
module load autoload openmpi
echo "Job started at " `date`
#   commands to remove old files
#   commands to compile the program
#   commands to execute the program
wait
echo "Job finished at " `date`
exit

Except for the parameters  -A, -W, -q, you can change the other values as needed.
You can launch execution with the command 'qsub <script-file>' and check job state 
with the command 'qstat'. 
This way execution is carried on while keeping the terminal available for interactive 
operations. 
Would you please find other details at http://www.hpc.cineca.it/content/batch-scheduler-pbs