Thanks for the advice! I am currently working on nextflow wrapping of the script. Coming back to my problem, I am attaching an stdout snippet below:

Running FASTP
fastp --thread=50 --length_required=10 --qualified_quality_phred=32 --in1=/home/cluster/nath/run6/query/fastq/SRR10333577_1.fastq.gz --in2=/home/cluster/nath/run6/query/fastq/SRR10333577_2.fastq.gz --out1=SRR10333577_1_trimmed.fastq.gz --out2=SRR10333577_2_trimmed.fastq.gz --json=SRR10333577_1.json --html=SRR10333577_1.html 
fastp v0.20.0, time used: 231 seconds
Running FASTQC
Started analysis of SRR10333577_1_trimmed.fastq.gz
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Running HISAT2
Settings:
  Output files: "index.*.ht2"
  Line rate: 6 (line is 64 bytes)
  Lines per side: 1 (side is 64 bytes)
  Offset rate: 4 (one in 16)
  FTable chars: 10
  Strings: unpacked
  Local offset rate: 3 (one in 8)
  Local fTable chars: 6
  Local sequence length: 57344
  Local sequence overlap between two consecutive indexes: 1024
  Endianness: little
  Actual local endianness: little
  Sanity checking: disabled
  Assertions: disabled
  Random seed: 0
  Sizeofs: void*:8, int:4, long:8, size_t:8
Input files DNA, FASTA:
  /home/cluster/nath/run6/query/ref_fa//ref.fa
Reading reference sizes
  Time reading reference sizes: 00:00:25
Calculating joined length
Writing header
Reserving space for joined string
Joining reference sequences
  Time to join reference sequences: 00:00:15
  Time to read SNPs and splice sites: 00:00:00
Using parameters --bmax 582334929 --dcv 1024
  Doing ahead-of-time memory usage test
  Passed!  Constructing with these parameters: --bmax 582334929 --dcv 1024
Constructing suffix-array element generator
Converting suffix-array elements to index image
Allocating ftab, absorbFtab
Entering GFM loop

I want all the stdout (including the echo points) to be saved to an external text file. I would be much obliged to get a detailed or semi-detailed idea on how to do that. Thanks!