Update file UNIX_HPC_cheat_sheet.md

exercises/UNIX_HPC_cheat_sheet.md

@@ -141,14 +141,30 @@ command1
 command2
 
 srun my_software_container.sif my_software [parameters]   
-
-
 ```
+
 Submit script as job to the computing nodes:
 ```bash
 sbatch myjob.sh
 ```
 
+Job arrays for applying the same processing routine with changed parameters for each instance (e.g., input files)
+
+```bash
+#!/usr/bin/env bash
+#SBATCH --cpus-per-task=[number]
+#SBATCH --mem=[memory]
+#SBATCH --time=[hr:min:sec]
+#SBATCH --job-name=[name]
+#SBATCH --output=[name]_%j.out
+#SBATCH --error=[name]_%j.err
+#SBATCH --array=1-16                    # specify size of array
+
+srun your_application $SLURM_ARRAY_TASK_ID
+
+```
+
+
 ## Managing jobs
 
 ```bash