For example you can see it here, this is the first one in the table (SRR1215996):

https://trace.ncbi.nlm.nih.gov/Traces/index.html?view=run_browser&acc=SRR1215996&display=metadata

Then you can do the following:

#!/bin/bash

module load sratoolkit

prefetch ${SRA_ID}  --max-size 100G --output-directory ${ILLUMINA_DIR} > ${ILLUMINA_DIR}/logs/${SRA_ID}.prefetch.log

fasterq-dump --split-files ${SRA_ID}

# You will get the following output from your command:
#spots read      : 10,934,900
#reads read      : 21,869,800
#reads written   : 21,869,800

Your fastq file will be called SRR1215996_1.fastq and SRR1215996_2.fastq