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  • Thank you @ilkkachu, great answer and works well!! Commented Mar 26, 2019 at 21:50
  • Hi @ilkkachu, I wonder if you could let me know if there's a way to escape the "stored as-is" under the cat << 'EOF' circumstance. More specifically, I want ${letter} in both bash script filename and within the script. Commented Mar 27, 2019 at 15:14
  • You mentioned that creating "one" script and passing the letter to it as a command line argument. Could you elaborate more on that? My original thought is to break down files based on alphabets and run in parallel. However, if there's a way to break down the files individually and run scripts in parallel would be even better, I should work on that. Commented Mar 27, 2019 at 15:15
  • @Molly_K, I tried to adapt your script to picking $letter from the command line. For parallel processing, you could write the script so that it processes just one file, and then run xargs -P or use GNU parallel to run a bunch of them at a time. Commented Mar 27, 2019 at 19:14
  • There's probably a dozen or so Q&A's about running scripts in parallel here on the site, see e.g. unix.stackexchange.com/q/169326/170373 and unix.stackexchange.com/q/211976/170373 and the search unix.stackexchange.com/… Commented Mar 27, 2019 at 19:16