Update file UNIX_HPC_exercise_instructions.md

exercises/UNIX_HPC_exercise_instructions.md

@@ -435,7 +435,7 @@
 **Objective:** running software from singularity images and submitting jobs to Science Cluster
 
 >**BEFORE WE START**
-Please run the following commands:
+Please run the following commands (copy and paste to your command line):
 ```sh
 mkdir /home/$USER/scratch/singularity_tmpdir
 echo "export SINGULARITY_TMPDIR=/home/$USER/scratch/singularity_tmpdir" >> $HOME/.bashrc