Hey, thanks for contributing. I would suggest though to add some documentation and confirm it works properly on Mac and Linux.

On Mac:

./foo.sh SRR5454413
./foo.sh: line 18: syntax error near unexpected token `&'
./foo.sh: line 18: `    then echo "Temp file download successful" |& tee -a Number_of_reads_in_fastq_files.txt'

./foo.sh < SRRs_to_process.txt 
./foo.sh: line 18: syntax error near unexpected token `&'
./foo.sh: line 18: `    then echo "Temp file download successful" |& tee -a Number_of_reads_in_fastq_files.txt'

./foo.sh SRRs_to_process.txt 
./foo.sh: line 18: syntax error near unexpected token `&'
./foo.sh: line 18: `    then echo "Temp file download successful" |& tee -a Number_of_reads_in_fastq_files.txt'

No idea how to use it. Please add documentation. I personally find it helpful if running the plain script without arguments returns a help page explaining the how-to's.