Why does find comand return "Permission denied" when it is command substituted and stored-CodePudding

So I am trying to find empty files that may exist in my project, as well as prevent their existence in future. I am doing this in a bash script like so.

#!/bin/bash -eu

if [[ "$(find . -type f -empty -not -path "./node_modules/*" | wc -l)" -gt 0 ]]; then
  echo "[check-for-empty-files] Empty files found. $(find . -type f -empty -not -path "./node_modules/*" -ls)"
  exit 1
else
  echo "[check-for-empty-files] No empties."
fi

... and it works as expected. However, the issue here is I'd like to store the find cmd in a variable like so:

empty_file_cmd=$(find . -type f -empty -not -path "./node_modules/*")

... so that I could use it in other places in the script. However this returns "Permission denied" and I cannot seem to figure out why that happens, given that the prior implementation does not return the "Permission denied" error.

CodePudding user response：

Don't store command lines in variables. For one thing, you'll screw up field separation and substitution. Instead use a function:

myFindCmd() {
  find . -type f -empty -not -path "./node_modules/*"
}

myFindCmd  # execute it whereever you like