The author's script (unknowingly) was relying on word splitting to convert string to cut-compatible format. Shellcheck suggested: "Double quote to prevent glob

The author's script (unknowingly) was relying on word splitting to convert string to cut-compatible format. Shellcheck suggested: "Double quote to prevent globbing and word splitting." Author implemented the suggestion, which (as advertised) prevented word splitting. The script stopped working. --- Related: every once in a while I talk to people who don't know how Unix argv vector works, and how come "system" takes space separated string which needs quoting, while "subprocess.run"/"execv" takes a list of strings which do not need quoting. Anyone knows a good blog post with concise explanation of this concept that I can send them to? Because all I am finding is either manpage-level document which assumes reader already knows the concept, or huge books which mention many unrelated things as well.